Baptism — Dipped in water

Outwardly it's a fairly simple procedure, in modern Hebrew the word for "baptize" — "tevilah" is derived from the Old Testament word "tabal", used in the story of Naaman the Syrian who was told to "immerse" or dip himself in the Jordan seven times. 2 Kings 5:14. Note too Naaman's initial reaction, pride and insult. But, praise God, he listened to the encouragement of his servants, humbled himself and obeyed.

In the New Testament, when it comes to being baptised into God’s church on earth i.e. being baptised into Christ — probably the key teaching comes in 1 Peter 3 where he compares its necessity for us to those who were (and weren’t) physically inside Noah’s ark when it rose up out of the waters (of judgment) back in 2362 BC. (see timeline)

It's like a gateway that we only need to go through once . See the passage below, with some hyperlinks to the original Greek.

1 Peter 3

But sanctify (set apart) the Lord God in your hearts: and be ready always to give an answer to every one that asks you a reason of the hope (security) that is in you with meekness (humility) and fear:
Isa 8:13

Having a good conscience; that, whereas they slander you, as of evildoers, they may be ashamed that falsely accuse your good behaviour in Christ.

For it is better, if the will of God be so, that you suffer for well doing, than for evil doing.

For Christ also has once suffered 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:

By which also he went and preached (proclaimed) to the spirits in prison (the guarded area);

Which in the past were disobedient (unpersuadable), when once the longsuffering of God waited (tarried) in the days of Noah, while the ark was being built, wherein few, that is, eight souls were saved by water.
Gen 6:3

The like figure whereunto even baptism does 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 Jesus Christ:

Who is gone into heaven, and is on the right hand of God; angels and authorities and powers being made subject unto him.

** End of passage