When John the Baptist told the wicked Pharisees that they were "offspring of vipers", he was baptizing sincere Jews for sins against the Mosaic Law, and asked rhetorically of the Pharisees: "Who has warned you to flee from the coming wrath ?" and then said for them to "produce fruits (or holy conduct) that befits repentance", but which the Pharisees felt that because they were Abraham's "offspring", they were "safe" from God's anger.(Matt 3:7-9)
However, John told them: "Do not presume to say to yourselves, ‘We have Abraham as our father.’ For I say to you that God is able to raise up children for Abraham from these stones. The ax is already lying at the root of the trees. Every tree, then, that does not produce fine fruit is to be cut down and thrown into the fire. I, for my part, baptize you with water because of your repentance, but the one coming after me is stronger than I am, whose sandals I am not worthy to take off. That one will baptize you with holy spirit and with fire. His winnowing shovel is in his hand, and he will clean up his threshing floor completely and will gather his wheat into the storehouse, but the chaff he will burn up with fire that cannot be put out."(Matt 3:9-12)
Those who fully accepted Jesus (who was baptized by John shortly after the above interaction, Matt 3:13-17) and showed genuine repentance of their often illicit behavior (such as "tax collectors and the prostitutes"), would later be baptized with holy spirit (Matt 21:28-32; Acts 2:4), but the Pharisees remained unchanged, keeping their arrogant stance, being noted for their public displays of righteousness to impress others, (Matt 6:1, 2, 5) so that they and the rest of the apostate nation of Israel would be baptized (or "immersed") with "fire", or destruction.(Note: the word Pharisee means "Separated Ones", because they stood aloof and away from every one else, putting themselves on a pedestal as if they were the only ones "righteous" and looked down on the common people, calling them "accursed people" or the ‛am-ha·’a´rets [Hebrew meaning "people of the land" but used in contemptuous sense by the Pharisees], see John 7:49)
As John noted, "his (or Jesus) winnowing shovel is in his hand (symbolically separating "the good from the bad", throwing away the "chaff"), and he will clean up his threshing floor completely and will gather his wheat (or those baptized with holy spirit as true Christians) into the storehouse, but the chaff he will burn up with (symbolic) fire that cannot be put out (or everlasting destruction, which Jesus called "Gehenna" at Matt 5:22, 30)."
Hence, the incorrigible nation of Israel received its fiery destruction or ' baptism by fire ' when General Titus laid siege to Jerusalem on April 3, 70 C.E., when many Jews had come for the annual Passover, and by August 30 of that year, Jerusalem lay totally destroyed, and in which Jesus words concerning the temple that "not a stone will be left on a stone" proved true.(Matt 24:2)
The Jewish historian Josephus gave an estimate of 1.1 million Jews having been slain, and some 97,000 taken captive by the Roman armies, only for some to die in gladiatorial fights as well as by other means or scattered among the nations.(The Jewish Wars, VI, 420, [ix, 3])
Thus, Jesus was the one who saw to it that the Pharisees and the rest of the apostate nation of Israel were ' baptized by fire ' by the destructive hand of the Romans because they rejected him as the promised Messiah, and whereby he said just three days before he was executed on a torture stake at the demands of the Jewish religious leaders (John 19:15; 1 Thess 2:14, 15), that "your house (or the temple in Jerusalem that was the center of worship for the Jews) is abandoned to you", with God having removed his favor and presence from it.(Matt 23:37-39)
His favor had now been transferred to "the Israel of God" or a "new nation" that is composed of both Jews and Gentiles, that are the 144,000 seen in Revelation and that make up God's Kingdom and are baptized or "sealed" with holy spirit.(Eph 1:13, 14; Rev 7:4; 14:1-3; Isa 26:1, 2; 66:7-10; Matt 21:42, 43; Gal 6:16; Note: God's personal name is Jehovah, Ps 83:18)