Mattityahu 3:11-12

I give you a tevilah (immersion) in a mikveh mayim for teshuva, but Hu Habah (He who Comes) after me has more chozek (strength) than me. I am not worthy to remove his sandals. He will give you a tevilah (immersion) with the Ruach Hakodesh and eish (fire). The winnowing fork is in his hand, and he will clear out his threshing floor, and he will gather his wheat into the storehouse; but the chaff he will burn with unquenchable eish (fire).