Original Verse:
Acts Chapter 10 Verse 39We are witnesses of everything he did both in the country of the Jews, and in Jerusalem; whom they also killed, hanging him on a tree.

Reference Verses:
Luke Chapter 24 Verse 48You are witnesses of these things.
Acts Chapter 4 Verse 10be it known to you all, and to all the people of Israel, that in the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead, in him does this man stand here before you whole.
Acts Chapter 5 Verse 30The God of our fathers raised up Jesus, whom you killed, hanging him on a tree.
Acts Chapter 10 Verse 41not to all the people, but to witnesses who were chosen before by God, to us, who ate and drank with him after he rose from the dead.
Acts Chapter 2 Verse 23him, being delivered up by the determined counsel and foreknowledge of God, you have taken by the hand of lawless men, crucified and killed;
Acts Chapter 2 Verse 36"Let all the house of Israel therefore know certainly that God has made him both Lord and Christ, this Jesus whom you crucified."
Acts Chapter 3 Verse 15and killed the Prince of life, whom God raised from the dead, to which we are witnesses.
Acts Chapter 13 Verse 29When they had fulfilled all things that were written about him, they took him down from the tree, and laid him in a tomb.
Galatians Chapter 3 Verse 13Christ redeemed us from the curse of the law, having become a curse for us. For it is written, "Cursed is everyone who hangs on a tree,"
1st Peter Chapter 2 Verse 24who his own self bore our sins in his body on the tree, that we, having died to sins, might live to righteousness; by whose stripes you were healed.