I'd like to make an observation about baptism with fire. Let's look at the text first:
Matt 3
[5] Then went out to him Jerusalem, and all Judaea, and all the region round about Jordan,
[6] And were baptized of him in Jordan, confessing their sins.
[7] But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?
Two catagories came:
1. Those who believed and were baptized, and
2. Those who did not believe and were warned about the wrath to come.
Matt. 3
[8] Bring forth therefore fruits meet for repentance:
[9] And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham.
[10] And now also the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire.
He made a clear distinction, that their lineage alone was not sufficient to cleanse them from their sin, it had to be a heartfealt repentance that resulted in good fruit. All else would be chopped down and cast into the fire.
Matt. 3
[11] I indeed baptize you with water unto repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire:
Three baptisms here:
1. John's baptism which was an outward sign of an inward decision, (not much different than our current N.T. church baptism.
2. Jesus' baptism with the Holy Ghost, which can be understood in the context of the following:
1 Corinthians 12
[12] For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ.
[13] For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.
[14] For the body is not one member, but many.
When we believe upon the Lord Jesus Christ, the Spirit of God baptizes us into his body, the church or the bride, whichever you like better...same thing.
The third baptism of Matt. 3
Matt. 3
[12] Whose fan is in his hand, and he will throughly purge his floor, and gather his wheat into the garner; but he will burn up the chaff with unquenchable fire.
Now we see that the baptism with fire is the wrath of God upon all who die in unbelief.
John 3
[36] He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
John the Baptist was warning them. Basically he was saying this, those you see here being baptized will prove by their good works, that they have believed upon the coming Messiah, you however, are going to have your OWN baptism, and you are not going to like it!