And we are witnesses of all things which he did both in the land of the Jews, and in Jerusalem; whom they slew and hanged on a tree:
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George Leo Haydock
Whom they killed. At the very first, says St. Chrysostom, the apostles preached Christ crucified, and tell them they had put to death on a cross the Lord of all things, the judge of the living and the dead. (Witham)
We may here admire how wonderfully Peter adapts his discourse to the capacity of his hearers. When speaking to the Jews, he proves Jesus to be their Messias, from the testimony of their prophets. On the present occasion, he only just alludes to the prophets, but confirms his discourse by the testimony of the miracles which Jesus had wrought in public, and were known to all the world. (Calmet)
both we, says he, and you. Then the Passion, and the reason why they do not believe: Whom also they slew, and hanged on a tree. Him God raised up the third day, and showed Him openly; not to all the people, but unto witnesses chosen before of God, even to us, who ate and drank with Him after He rose from the dead. (v. 40, 41.) This is a proof of the Resurrection. And he commanded us to preach unto the people, and to testify that it is He which was ordained of God to be the Judge of quick and dead.