Matthew 10:18-20

and you will be brought before governors and kings for My sake, as witnesses to them and to the Gentiles. But when they hand you over, do not worry about how or what you are to say; for what you are to say will be given you within that [very]hour; [Mark 13:11-13; Luke 21:12-19] for it is not you speaking, but the Spirit of your Father speaking through you.