Lc 3:15-17
Now the people were filled with expectation, and all were asking in their hearts whether John might be the Messiah. John answered them all, saying, "I am baptizing you with water, but one mightier than I is coming. I am not worthy to loosen the thongs of his sandals. He will baptize you with the holy Spirit and fire. His winnowing fan is in his hand to clear his threshing floor and to gather the wheat into his barn, but the chaff he will burn with unquenchable fire.".