The Resurrection of Christ was Attested by Apostles

…beginning from John’s baptism until the day Jesus was taken up from us. For one of these must become a witness with us of His resurrection.”

God has raised this Jesus to life, to which we are all witnesses.

You killed the Author of life, but God raised Him from the dead, and we are witnesses of this fact.

With great power the apostles continued to give their testimony about the resurrection of the Lord Jesus. And abundant grace was upon them all.