John Chrysostom
Catena Aurea · Lukasevangelium 3
And as the people were in expectation, and all men mused in their hearts of John, whether he were the Christ, or not; John answered, saying unto them all, I indeed baptize you with water; but one mightier than I cometh, the latchet of whose shoes I am not worthy to unloose: he shall baptize you with the Holy Ghost and with fire. Whose fan is in his hand, and he will throughly purge his floor, and will gather the wheat into his garner; but the chaff he will burn with fire unquenchable.
(ubi sup.) And having said that his own baptism was only with water, he next shews the excellence of that baptism which was brought by Christ, adding, He shall baptize you with the Holy Spirit, and fire, signifying by the very metaphor which he uses the abundance of grace. For he says not, “He shall give you the Holy Spirit,” but He shall baptize you. And again, by the addition of fire, he shews the power of grace. And as Christ calls the grace of the Spirit, water, (John 4:14; 7:38.) meaning by water the purity resulting from it, and the abundant consolation which is brought to minds which are capable of receiving Him; so also John, by the word fire, expresses the fervour and uprightness of grace, as well as the consuming of sins.