Acts 19:3-6 And he (Paul) said unto them, Unto what then were you baptized? And they said Unto John's baptism. 4 Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Messiah Yahushua. 5 When they heard this, they were baptized in the name of the Master Yahushua. 6 And when Paul had laid his hands upon them; and they spake with tongues, and prophesied.
Acts 16:33 read the story
Baptism in your Strong's Concordance is 911, 907, 908
911 (bapto,Greek) meaning Whelm cover wholly with a fluid.
In this context of baptism is burying the old man in Yahushua's name;
And being raised in newness of life. I Peter 3:21 The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Yahushua Messiah.
I Corinthians 15:29 is raising the question why you should be baptized. I Corinthians 15:29 Else what shall they do which are baptized for the dead, if the dead rise not at all? Why are they then baptized for the dead?
Romans 6:3-5 Know you not, that so many of us as were baptized into Yahushua Messiah were baptized into His death? 4 Therefore we are buried with Him by baptism into death: that like as Messiah was raised up 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 planted together in the likeness of His death, we shall be also in the likeness of His resurrection:
Yahushua Mark 16:16a He that believeth and is baptized shall be saved;
I John 5:10 He that believeth on the Son of Elohim hath the witness in himself: he that believeth not Elohim hath made Him a liar; because he believeth not the record that Elohim gave of His Son.
The water, blood, and the Spirit are 1.water of the baptism into Yahushua's death, 2. The atoning of His blood, 3. the witness of truth of the Holy Spirit and my spirit for salvation.
Halle lu Yah to the Lamb Yahushua