John continues in describing portions of that which YAHSHUA does and will do.

Matt 3:
12 Whose fan is in his hand, and he will throughly purge his floor, and gather his wheat into the garner; but he will burn up the chaff with unquenchable fire.

"fan"
4425 ptuon (ptoo'-on);
from 4429; a winnowing-fork (as scattering like spittle):
KJV-- fan.
4429 ptuo (ptoo'-o);
a primary verb (compare 4428); to spit:
KJV-- spit.
4428 ptusso (ptoos'-so);
probably akin to petannumi (to spread; and thus apparently allied to 4072 through the idea of expansion, and to 4429 through that of flattening; compare 3961); to fold, i.e. furl a scroll:
KJV-- close.

4425 ptuon-
a winnowing shovel
4429 ptuo-
to spit
4428 ptusso-
to fold together, to roll up

"hand"
5495 cheir (khire);
perhaps from the base of 5494 in the sense of its congener the base of 5490 (through the idea of hollowness for grasping); the hand (literally or figuratively [power]; especially [by Hebraism] a means or instrument):
KJV-- hand.

5495 cheir-
1) by the help or agency of any one, by means of anyone
2) figuratively applied to God symbolizing His might, activity, power
a) in creating the universe
b) in upholding and preserving (God is present protecting and aiding one)
c) in punishing
d) in determining and controlling the destinies of men

"he will throughly purge"
1245 diakatharizo (dee-ak-ath-ar-id'-zo);
from 1223 and 2511; to cleanse perfectly, i.e. (specially) winnow:
KJV-- thoroughly purge.
1223 dia (dee-ah');
a primary preposition denoting the channel of an act; through (in very wide applications, local, causal, or occasional):
KJV-- after, always, among, at, to avoid, because of (that), briefly, by, for (cause). ..fore, from, in, by occasion of, of, by reason of, for sake, that, thereby, therefore, X though, through (-out), to, wherefore, with (-in). In composition it retains the same general import.
***. Dia. See 2203.
2511 katharizo (kath-ar-id'-zo);
from 2513; to cleanse (literally or figuratively):
KJV-- (make) clean (-se), purge, purify.
2513 katharos (kath-ar-os');
of uncertain affinity; clean (literally or figuratively):
KJV-- clean, clear, pure.

1245 diakatharizo-
to cleanse thoroughly
1223 dia-
1) through
a) used of place
1) with
2) in
b) used of time
1) throughout
2) during
c) used of means
1) by
2) by the means of
2) through
the ground or reason by which something is or is not done
a) by reason of
b) on account of
c) because of for this reason
d) therefore
e) on this account
2511 katharizo-
1) to make clean, to cleanse
a) from physical stains and dirt or disease
1) utensils, food
2) to cleanse a leper by curing him
3) to remove by cleansing
b) in a moral sense
1) to free from defilement of sin and from faults
2) to purify from wickedness
3) to free from guilt of sin, to purify
4) to consecrate by cleansing or purifying
5) to consecrate, dedicate
2) to pronounce clean in a Levitical sense
2513 katharos-
clean, pure
a) physically:
1) purified by fire
2) in a similitude, like a vine cleansed by pruning and so fitted to bear fruit
b) in a Levitical sense:
clean, the use of which is not forbidden, imparts no uncleanness
c) ethically:
1) free from corrupt desire, from sin and guilt
2) free from every admixture of what is false, sincere genuine
3) blameless, innocent
4) unstained with the guilt of anything

"floor"
257 halon (hal'-ohn);
probably from the base of 1507; a threshing-floor (as rolled hard), i.e. (figuratively) the grain (and chaff, as just threshed):
KJV-- floor.
1507 heilisso (hi-lis'-so);
a prolonged form of a primary but defective verb heilo (of the same meaning); to coil or wrap:
KJV-- roll together. See also 1667.

257 halon-
a ground plot or threshing floor, that is, a place in the field made hard after the harvest by a roller, where grain was threshed out
1507 heilisso-
to roll up or to roll together

"gather"
4863 sunago (soon-ag'-o);
from 4862 and 71; to lead together, i.e. collect or convene; specifically, to entertain (hospitably):
KJV-- + accompany, assemble (selves, together), bestow, come together, gather (selves together, up, together), lead into, resort, take in.
4862 sun (soon);
a primary preposition denoting union; with or together (but much closer than 3326 or 3844), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.:
KJV-- beside, with. In composition it has similar applications, including completeness.
71 ago (ag'-o);
a primary verb; properly, to lead; by implication, to bring, drive, (reflexively) go, (specially) pass (time), or (figuratively) induce:
KJV-- be, bring (forth), carry, (let) go, keep, lead away, be open.

4863 sunago-
1) to gather together, to gather;
to draw together, to collect:
a) used of fishes
b) used of a net in which they are caught
2) to bring together, to assemble, to collect
a) to join together, to join in one (those previously separated)
b) to gather together by convoking
c) to be gathered that is, to come together, to gather, to meet
3) to lead with oneself;
into one's home, that is, to receive hospitably, to entertain
4862 sun-
with
71 ago-
1) to lead, to take with one
a) to lead by laying hold of, and this way to bring to the point of destination: of an animal
b) to lead by accompanying to (into) a place
c) to lead with oneself, to attach to oneself as an attendant
d) to conduct, to bring
e) to lead away, to a court of justice, magistrate, etc.
2) to lead,
a) to lead, to guide, to direct
b) to lead through, to conduct (to something)
c) to move, to impel: used of forces and influences on the mind
3) to pass a day, to keep or celebrate a feast, etc.
4) to go, to depart

"garner"
596 apotheke (ap-oth-ay'-kay);
from 659; a repository, i.e. granary:
KJV-- barn, garner.
659 apotithemi (ap-ot-eeth'-ay-mee);
from 575 and 5087; to put away (literally or figuratively):
KJV-- cast off, lay apart (aside, down), put away (off).
575 apo (apo');
a primary particle; "off," i.e. away (from something near), in various senses (of place, time, or relation; literal or figurative):
KJV-- (X here-) after, ago, at, because of, before, by (the space of), for (-th), from, in, (out) of, off, (up-) on (-ce),
since, with. In composition (as a prefix) it usually denotes separation, departure, cessation, completion, reversal, etc.
5087 tithemi (tith'-ay-mee); a prolonged form of a primary theo (theh'-o) (which is used only as alternate in certain tenses); to place (in the widest application, literally and figuratively; properly, in a passive or horizontal posture, and thus different from 2476, which properly denotes an upright and active position, while 2749 is properly reflexive and utterly prostrate):
KJV-- + advise, appoint, bow, commit, conceive, give, X kneel down, lay (aside, down, up), make, ordain, purpose,
put, set (forth), settle, sink down.

596 apotheke-
1) a place in which anything is laid by or laid up
2) a storehouse, a granary
659 apotithemi-
to put off, to put aside, to put away
575 apo-
1) used of separation
a) used of local separation, after verbs of motion from a place
that is, of departing, of fleeing
b) used of separation of a part from the whole
where of a whole some part is taken
c) used of any kind of separation of one thing from another by
which the union or fellowship of the two is destroyed
d) used of a state of separation, that is, of distance:
physical: used of distance of place temporal: used of distance of time
2) used of origin
a) used of the place whence anything is, comes, befalls, is taken
b) used of origin of a cause
5087 tithemi-
1) to set, to put, to place
a) to place or to lay
b) to put down, to lay down
1) to bend down
2) to lay off or aside, to wear or to carry no longer
3) to lay by, to lay aside money
c) to set on (serve) something to eat or to drink
d) to set forth, something to be explained by discourse
2) to make; to make (or set) for oneself or for one's use
3) to set, to fix establish
a) to set forth
b) to establish, to ordain

"he will burn up"
2618 katakaio (kat-ak-ah'-ee-o);
from 2596 and 2545; to burn down (to the ground), i.e. consume wholly:
KJV-- burn (up, utterly).
2596 kata (kat-ah');
a primary particle; (prepositionally) down (in place or time), in varied relations (according to the case [genitive case, dative case or accusative case] with which it is joined):
KJV-- about, according as (to), after, against, (when they were) X alone, among, and, X apart, (even, like) as (concerning, pertaining to touching), X aside, at, before, beyond, by, to the charge of, [charita-] bly, concerning, + covered, [daily-], down, every, (+far more) exceeding, X more excellent, for, from ... to, godly, in (-asmuch, divers, every, -to, respect of), ... by, after the manner of, + by any means, beyond (out of) measure, X mightily, more, X natural, of (up-) on (X part), out (of every), over against, (+your) X own, + particularly, so, through (-oughout, -oughout every), thus, (un-) to (-gether, -ward), X uttermost, where (-by), with. In composition it retains many of these applications, and frequently denotes opposition, distribution, or intensity.
2545 kaio (kah'-yo);
apparently a primary verb; to set on fire, i.e. kindle or (by implication) consume:
KJV-- burn, light.

2618 katakaio-
to burn up, to consume by fire
2596 kata-
1) down from, throughout
2) according to, toward, along
2545 kaio-
1) to set on fire, to light
2) to burn, consume with fire

YAHSHUA has the power to separate the wheat from the chaff.
And, HIS fire (lightning, awesome power) shall utterly consume the chaff, yet it shall not harm the wheat.
The wheat is gathered into HIS storehouse.

Please note that this verse speaks of HIS fan, HIS hand, HIS floor, and HIS wheat.
The chaff is not of HIM, and therefore, is consumed with and by YAHOVAH'S/YAHSHUA'S fire.