Paul had to OBEY Jesus:
Acts 9:5 "Who are you, Lord?" Saul asked. "I am Jesus, whom you are persecuting," he replied.
6 but get up and enter the city, and it will be told you what you must do."…
Paul went, he fasted; he did not eat or drink anything for three days.
Acts 9:9 And he was three days without sight, and neither ate nor drank.
Paul spent this time praying. If you do not think that Paul spent this time begging for forgiveness and repenting, then you would be badly mistaken.
Acts 9:11 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.
When Paul had his vision restored to him, he was told to get up, be baptized and wash his sins away, calling on the Lord.
When people were baptized with water that was symbolic of having their sins washed away, after they repented.
In addition, people came out of the water after repenting and being baptized, they called upon the name of the Lord.
We are told to believe, and repent, and to call upon the name of the Lord.
I was saved by doing exactly as Jesus said.