Acts 10:39

39. Not content with assuming that these facts were familiar to them, Peter gives them a surer foundation for their convictions, by presenting the testimony upon which he relies to prove the facts. (39) "And we are witnesses of all things which he did both in the land of the Jews and in Jerusalem, whom they slew, hanging him upon a tree." In view of the fact that Cornelius had been "warned from God by a holy angel," to send for Peter and hear what he had to say, no confirmation of this his testimony was needed. They were prepared to receive everything he might say to them as a message from God.