Acts 1 3
During the forty days after he suffered and died, he appeared to the apostles from time to time, and he proved to them in many ways that he was actually alive. And he talked to them about the Kingdom of God.
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AMP Acts 1:3To them also He showed Himself alive after His passion (His suffering in the garden and on the cross) by [a series of] many convincing demonstrations [unquestionable evidences and infallible proofs], appearing to them during forty days and talking [to them] about the things of the kingdom of God.