Acts 9:5

And he said, Who art thou, Lord? Saul is sensible of the Divine nature of the vision, and shews this by his address. The appearance of Christ, though in a glorified body, must have been like that which He wore in His humanity, and since Saul does not recognize Jesus, we may almost certainly conclude that he had not known Him during His ministerial life.

And the Lord said The best texts have only "And he," the verb "said" being understood.

I am Jesus whom thou persecutest In Acts 22:8 St Paul gives the fuller form of the sentence, "I am Jesus of Nazareth." By using this name, the being whose Divine nature Saul has already acknowledged by calling him "Lord," at once and for ever puts an end to Saul's persecuting rage, for he is made to see, what his master Gamaliel had before suggested (Acts 5:39), that to persecute Jesus was to "fight against God."

it is hard for thee to kick against the pricks. 6. And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him These words have been inserted here in some MSS. for the sake of making in this place a complete narrative by the combination and adaptation of the additional particulars given in Acts 26:14 and Acts 22:10. It is easy to understand the desire which prompted such a combination. The best MSS. omit the words here, giving them where they more naturally find place, in the personal narratives of St Paul himself.