And it came to pass after three days that Paul called the leaders of the Jews together. So when they had come together, he said to them: “Men and brethren, though I have done nothing against our people or the customs of our fathers, yet I was delivered as a prisoner from Jerusalem into the hands of the Romans, 18 who, when they had examined me, wanted to let me go, because there was no cause for putting me to death. 19 But when the Jews spoke against it, I was compelled to appeal to Caesar, not that I had anything of which to accuse my nation. 20 For this reason therefore I have called for you, to see you and speak with you, because for the hope of Israel I am bound with this chain.”
21 Then they said to him, “We neither received letters from Judea concerning you, nor have any of the brethren who came reported or spoken any evil of you. 22 But we desire to hear from you what you think; for concerning this sect, we know that it is spoken against everywhere.” — Acts 28:17-22.
In Rome, Paul calls the leaders of the Jews together and explains the situation and the charges against him. They have not heard of anything evil about him but have heard about the ‘sect’ of Christianity, which is spoken against everywhere. They want to hear Paul. His policy is to begin by witnessing to the Jews, despite his new concentration on reaching the Gentiles.