'Testifying' in the Bible

But when Silas and Timothy came down from Macedonia, Paul was constrained by the word, testifying to the Jews that Jesus was the Christ.

testifying both to Jews and to Greeks repentance toward God, and faith toward our Lord Jesus Christ.

Having therefore obtained the help that is from God, I stand unto this day testifying both to small and great, saying nothing but what the prophets and Moses did say should come;

And when they had appointed him a day, they came to him into his lodging in great number; to whom he expounded the matter, testifying the kingdom of God, and persuading them concerning Jesus, both from the law of Moses and from the prophets, from morning till evening.