Acts 1:3
3 fHe presented himself alive to them after his suffering by many proofs, appearing to them during forty days and speaking about the kingdom of God.
Acts 28:23
23 When they had appointed a day for him, they came to him at his lodging in greater numbers. From morning till evening ohe expounded to them, testifying to pthe kingdom of God and qtrying to convince them about Jesus rboth from the Law of Moses and from the Prophets.