Why should I get baptized?

Because baptism is a commandment of God for every believer. It is the first act of obedience a believer is asked to do. To choose not to be baptized is to choose to disobey God.

Because baptism is an act that God chose to demonstrate the death, burial and resurrection of Christ (salvation) and our uniting ourselves to that act which saved us.

Water Baptism is an act of obedience for the believer. It should be preceded by belief and repentance. Baptism accompanied every conversion in the New Testament, and was always performed at the same time as the decision to believe.

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Matthew 28:19 — ~"Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit,

Acts 8:12 — But when they believed Philip preaching the good news about the kingdom of God and the name of Jesus Christ, they were being baptized, men and women alike.

Acts 8:13 — Even Simon himself believed; and after being baptized, he continued on with Philip, and as he observed signs and great miracles taking place, he was constantly amazed.

Acts 8:36-38 — As they went along the road they came to some water; and the eunuch *said, "Look! Water! What prevents me from being baptized?"
[(Early mss do not contain this v) And Philip said, "If you believe with all your heart, you may." And he answered and said, "I believe that Jesus Christ is the Son of God."]
And he ordered the chariot to stop; and they both went down into the water, Philip as well as the eunuch, and he baptized him.

Acts 2:38 — Peter {said} to them, "Repent, and each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you will receive the gift of the Holy Spirit.

Acts 2:41 — So then, those who had received his word were baptized; and that day there were added about three thousand (I.e. persons) souls.

Acts 22:16 — ~`Now why do you delay? Get up and be baptized, and wash away your sins, calling on His name.'

Romans 6:4-5 — Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life.
For if we have become united with {Him} in the likeness of His death, certainly we shall also be {in the likeness} of His resurrection,

I Corinthians 6:11 — Such were some of you; but you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus Christ and in the Spirit of our God.

Colossians 2:11-12 — and in Him you were also circumcised with a circumcision made without hands, in the removal of the body of the flesh by the circumcision of Christ;
having been buried with Him in baptism, in which you were also raised up with Him through faith in the working of God, who raised Him from the dead.

I Peter 3:21 — Corresponding to that, baptism now saves you--not the removal of dirt from the flesh, but an appeal to God for a good conscience--through the resurrection of Jesus Christ,