The book Acts records three accounts of Paul’s conversion. In Acts 26, Paul tells the story, but stops at the vision he received on the road to Damascus. In Acts 22, he tells the story while speaking to a mob that had just tried to kill him. In Acts 9, Luke records the story himself.

Here’s the account from Acts 9:

“As he neared Damascus on his journey, suddenly a light from heaven flashed around him. He fell to the ground and heard a voice say to him, “Saul, Saul, why do you persecute me?” “Who are you, Lord?” Saul asked. “I am Jesus, whom you are persecuting,” he replied. “Now get up and go into the city, and you will be told what you must do.” The men traveling with Saul stood there speechless; they heard the sound but did not see anyone. Saul got up from the ground, but when he opened his eyes he could see nothing. So they led him by the hand into Damascus. For three days he was blind, and did not eat or drink anything. In Damascus there was a disciple named Ananias. The Lord called to him in a vision, “Ananias!” “Yes, Lord,” he answered. The Lord told him, “Go to the house of Judas on Straight Street and ask for a man from Tarsus named Saul, for he is praying. In a vision he has seen a man named Ananias come and place his hands on him to restore his sight.” “Lord,” Ananias answered, “I have heard many reports about this man and all the harm he has done to your saints in Jerusalem. And he has come here with authority from the chief priests to arrest all who call on your name.” But the Lord said to Ananias, “Go! This man is my chosen instrument to carry my name before the Gentiles and their kings and before the people of Israel. I will show him how much he must suffer for my name.” Then Ananias went to the house and entered it. Placing his hands on Saul, he said, “Brother Saul, the Lord—Jesus, who appeared to you on the road as you were coming here—has sent me so that you may see again and be filled with the Holy Spirit.” Immediately, something like scales fell from Saul’s eyes, and he could see again. He got up and was baptized, and after taking some food, he regained his strength.” (Acts 9:3–19)

And here’s how Paul told the story in Acts 22:

“About noon as I came near Damascus, suddenly a bright light from heaven flashed around me. I fell to the ground and heard a voice say to me, ‘Saul! Saul! Why do you persecute me?’ “ ‘Who are you, Lord?’ I asked. “ ‘I am Jesus of Nazareth, whom you are persecuting,’ he replied. My companions saw the light, but they did not understand the voice of him who was speaking to me. “ ‘What shall I do, Lord?’ I asked. “ ‘Get up,’ the Lord said, ‘and go into Damascus. There you will be told all that you have been assigned to do.’ My companions led me by the hand into Damascus, because the brilliance of the light had blinded me. “A man named Ananias came to see me. He was a devout observer of the law and highly respected by all the Jews living there. He stood beside me and said, ‘Brother Saul, receive your sight!’ And at that very moment I was able to see him. “Then he said: ‘The God of our fathers has chosen you to know his will and to see the Righteous One and to hear words from his mouth. You will be his witness to all men of what you have seen and heard. And now what are you waiting for? Get up, be baptized and wash your sins away, calling on his name.’” (Acts 22:6–16)

In Acts 9, Ananias says that he had come to end Paul’s blindness and to allow him to be filled with the Holy Spirit. Then Paul is healed (Ananias has placed his hands on Paul) and proceeds to be baptized. Little is said about why Paul was baptized.

In Acts 22, Ananias tells Paul to be baptized. Part of that baptism is a “calling on the name of the Lord.” One result of that baptism is the washing away of Paul’s sins.

The connection between “baptism” and “washing” is intentional here. When the believer calls upon the name of the Lord in coming to him for salvation, his sins are washed away. An integral part of that “calling” is the act of being baptized in water.