Luke 3:15-18 (KJV)
15 And as the people were in expectation, and all men mused in their hearts of John, whether he were the Christ, or not; 16 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: 17 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. 18 And many other things in his exhortation preached he unto the people.