And he fell to the earth - He was astonished and overcome by the sudden flash of light. There is a remarkable similarity between what occurred here, and what is recorded of Daniel in regard to the visions which he saw, Daniel 8:17. Also Daniel 10:8, “Therefore I was left alone, and saw this great vision; and there remained no strength in me, for my comeliness (vigor) was turned into corruption, and I retained no strength.” The effect was such as to overpower the body.
And heard a voice - The whole company heard a voice Acts 9:7, but did not distinguish it as addressed particularly to Saul. He heard it speaking to himself.
Saying unto him ... - This shows that it was not thunder, as many have supposed. It was a distinct articulation or utterance, addressing him by name.
Saul, Saul - A mode of address that is emphatic. The repetition of the name would fix his attention. Thus, Jesus addresses Martha Luke 10:41, and Simon Luke 22:31, and Jerusalem Matthew 23:37.
Why - For what reason. Jesus had done him no injury; had given him no provocation. All the opposition of sinners to the Lord Jesus and his church is without cause. See the notes on John 15:25, “They hated me without a cause.”
Persecutest - See the notes on Matthew 5:11.
Thou me? - Christ and his people are one, John 15:1-6. To persecute them, therefore, was to persecute him, Matthew 25:40, Matthew 25:45.