From the Treasury of Daily Prayer:

St. Paul’s life-changing experience on the road to Damascus is related three times in the book of Acts (9:1-9; 22:6-11; 26:12-18). As an archenemy of Christians, Saul of Tarsus set out for Damascus to arrest and bring believers to Jerusalem for trial. While on the way, he saw a blinding light and heard the words: “Saul, Saul, why are you persecuting me?” Saul asked, “Who are You, Lord?” The reply came, “I am Jesus, whom you are persecuting.” In Damascus, where Saul was brought after being blinded, a disciple named Ananias was directed by the Lord in a vision to go to Saul to restore his sight: “Go, for he is a chosen instrument of Mine to carry My name before the Gentiles and kings and the children of Israel” (Acts 9:15). After receiving his sight, Saul was baptized and went on to become known as Paul, the great apostle.