“And when they had appointed him a day, there came many to him into his lodging; to whom he expounded and testified the kingdom of God, persuading them concerning Jesus, both out of the law of Moses, and out of the prophets, from morning till evening.”
King James Version (KJV)
28:23 To whom he expounded, testifying the kingdom of God, and persuading them concerning Jesus - These were his two grand topics, That the kingdom of the Messiah was of a spiritual, not temporal nature: That Jesus of Nazareth was the very person foretold, as the Lord of that kingdom. On this head he had as much need to persuade as to convince, their will making as strong a resistance as their understanding.
Ac 28:23 When they had appointed him a day. On the appointed day "many" came. The whole day was spent persuading them concerning Jesus. Arguing from Moses and the prophets, that Jesus was he of whom the law and the prophets spoke.