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John's baptism was of repentance, for the remission of sins. However, his baptism only was in effect until Christ died and His new covenant was established. This can be seen by the fact that Paul told those in Ephesus that had been baptized with John's baptism that they needed to be baptized in the name of Christ.

Matthew 28:18-20 -
18 And Jesus came and spoke to them, saying, "All authority has been given to Me in heaven and on earth.
19 "Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son
and of the Holy Spirit,
20 "teaching them to observe all things that I have commanded you; and lo, I am with you always,
[even] to the end of the age." Amen.

Mark 16:15-16 -
15 And He said to them, "Go into all the world and preach the gospel to every creature.
16 "He who believes and is baptized will be saved; but he who does not believe will be condemned.

John 3:1-6 -
1 There was a man of the Pharisees named Nicodemus, a ruler of the Jews.
2 This man came to Jesus by night and said to Him, "Rabbi, we know that You are a teacher come from God;
for no one can do these signs that You do unless God is with him."
3 Jesus answered and said to him, "Most assuredly, I say to you, unless one is born again,
he cannot see the kingdom of God."
4 Nicodemus said to Him, "How can a man be born when he is old? Can he enter a second time into his mother's womb
and be born?"
5 Jesus answered, "Most assuredly, I say to you, unless one is born of water and the Spirit,
he cannot enter the kingdom of God.
6 "That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.

Acts 2:36-41 -
36 "Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified,
both Lord and Christ."
37 Now when they heard [this,] they were cut to the heart, and said to Peter and the rest of the apostles,
"Men [and] brethren, what shall we do?"
38 Then Peter said to them, "Repent, and let every one of you be baptized in the name of Jesus Christ for
the remission of sins; and you shall receive the gift of the Holy Spirit.
39 "For the promise is to you and to your children, and to all who are afar off, as many as the Lord our
God will call."
40 And with many other words he testified and exhorted them, saying, "Be saved from this perverse generation."
41 Then those who gladly received his word were baptized; and that day about three thousand souls were added [to them.]

Acts 22:12-16 -
12 "Then a certain Ananias, a devout man according to the law, having a good testimony with all the Jews who dwelt [there,]
13 "came to me; and he stood and said to me, 'Brother Saul, receive your sight.' And at that same hour I looked up at him.
14 "Then he said, 'The God of our fathers has chosen you that you should know His will, and see the Just One,
and hear the voice of His mouth.
15 'For you will be His witness to all men of what you have seen and heard.
16 'And now why are you waiting? Arise and be baptized, and wash away your sins, calling on the name of the Lord.'

Romans 6:3-7 -
3 Or do you not know that as many of us as were baptized into Christ Jesus were baptized into His death?
4 Therefore we were buried with Him through baptism into death, that just as Christ was raised from the
dead by the glory of the Father, even so we also should walk in newness of life.
5 For if we have been united together in the likeness of His death, certainly we also shall be [in the likeness]
of [His] resurrection,
6 knowing this, that our old man was crucified with [Him,] that the body of sin might be done away with,
that we should no longer be slaves of sin.
7 For he who has died has been freed from sin.

Galatians 3:26-27 -
26 For you are all sons of God through faith in Christ Jesus.
27 For as many of you as were baptized into Christ have put on Christ.

Colossians 2:9-12 -
9 For in Him dwells all the fullness of the Godhead bodily;
10 and you are complete in Him, who is the head of all principality and power.
11 In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins
of the flesh, by the circumcision of Christ,
12 buried with Him in baptism, in which you also were raised with [Him] through faith in the working of God,
who raised Him from the dead.

1 Peter 3:18-22 -
18 For Christ also suffered once for sins, the just for the unjust, that He might bring us to God,
being put to death in the flesh but made alive by the Spirit,
19 by whom also He went and preached to the spirits in prison,
20 who formerly were disobedient, when once the Divine longsuffering waited in the days of Noah,
while [the] ark was being prepared, in which a few, that is, eight souls, were saved through water.
21 There is also an antitype which now saves us -- baptism (not the removal of the filth of the flesh,
but the answer of a good conscience toward God), through the resurrection of Jesus Christ,
22 who has gone into heaven and is at the right hand of God, angels and authorities and powers having
been made subject to Him.