Friend, there are those who say baptism is not necessary. Yet there is not one account of salvation in the new testament after the resurrection of Christ were baptism is not involved.
Mathew 3:13 -17 reads,
"Then Jesus arrived from Galilee at the Jordan coming to John, to be baptized by him.
But John tried to prevent Him saying, "I have need to be baptized by You, and do You come to me?
But Jesus answering said to him, "Permit it at this time; for in this way it is fitting for us to fulfill all righteousness" Then he permitted Him.
And after being baptized, Jesus went up immediate from the water; and behold, the heavens were opened, and he saw the Spirit of God descending as a dove, and coming upon Him, and behold, a voice out of the heavens, saying, "This is My beloved Son, in whom I am well pleased."
Jesus got baptized and was not a sinner, but showed His obedience to His Father.
Jesus says in Mark 16:15-16, ". . ."Go into all the world and preach the gospel to all creation.
He who has believed and has been baptized shall be saved; but he who has disbelieved shall be condemned."
Acts 2:38 reads, "and Peter said to them,
Repent, and let each of you be baptized in the name of Jesus Christ for the forgiveness of your sins; and you shall receive the gift of the Holy Spirit."
Acts 8:29 - 39 reads,
"And the Spirit said to Philip, "Go up and join this chariot." And when Philip had run up, he heard him reading Isaiah the prophet, and said, "Do you understand what you are reading?" And he said, "Well, how could I, unless someone guides me?" And he invited Philip to come up and sit with him. Now the passage of Scripture which he was reading was this:
"He was led as a sheep to slaughter; And as a lamb before its shear is silent, So he does not open his mouth. In humiliation His judgment was taken away; Who shall related his generation? For His life is removed from the earth."
And the eunuch answered Philip and said, "Please tell me, of whom does the prophet say this? Of himself, or of someone else?" And Philip opened his mouth and beginning from this Scripture he preached Jesus to him. And as they went along the road they came to some water; and the eunuch said, "Look! Water! What prevents me from being baptized?
And Philip said, "If you believe with all you 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. And when they came up out of the water, the Spirit of the Lord snatched Philip away; and the eunuch saw him no more, but went on his way rejoicing."
The scripture that the eunuch read in Isaiah has no mention of baptism. So Philip obviously mentioned baptism to him. Also, only after the eunuch was baptized did the Spirit of the Lord snatch Philip away.
Acts 16:25-33 reads,"But about midnight Paul and Silas were praying and singing hymns of praise to God, and the
prisoners were listening to them:
and suddenly there came a great earthquake, so that the foundation of the prison
house were shaken; and immediately
everyone's chains were unfastened.
And when the jailer had been roused out of sleep and had seen the prison doors opened, he drew his sword and was about to kill
himself, supposing that the prisoners had escaped.
But Paul cried out with a loud voice, saying, "Do yourself no harm, for we are all here!"
And he called for lights and rushed in and, trembling with fear, he fell down before Paul and Silas,
and after he brought them out, he said, "Sirs, what must I do to be saved?"
And they said, "Believe in the Lord Jesus, and you shall be saved, you and your household."
And they spoke the word of the Lord to him together with all who were in his house.
And he took them that very hour of the night and washed their wounds, and immediately he was baptized, he and all his household."