Saul/Paul is still breathing out murderous threats on the Lord's disciples because he thought that these Christians were going against God, so he punished, beat up, and got these Christians thrown in jail.
Paul then 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," the Holy Spirit replied. "Now get up and go into the city, and you will be told what you must do."
The men traveling with Saul were speechless; they heard a sound but did not see anyone. Saul got up from the ground, but when he opened his eyes he could see nothing. For three days he was blind and did not eat or drink anything.
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.
Saul spent several days with the disciples in Damascus. At once he began to preach in the synagogues that Jesus is the Son of God. All those who heard him were astonished and asked, " Isn't he the man who raised havoc in Jerusalem among those who call on this name? And hasn't he come here to take them as prisoners to the chief priest?" Yet Saul grew more and more powerful and baffled the Jews living in Damascus by providing that Jesus is the Messiah.