Acts 2v38: "Then Peter said to them,"Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit."
Acts 3v19: "Repent therefore and be converted, that your sins may be blotted out, so that times of refreshing may come from the presence of the Lord."
Acts 17v30,31: "Truly, these times of ignorance God overlooked, but now commands all men everywhere to repent, because He has appointed a day on which He will judge the world in righteousness by the Man whom He has ordained. He has given assurance of this to all by raising Him from the dead."
Acts 26v20: "but declared first to those in Damascus and in Jerusalem, and throughout all the region of Judea, and then to the Gentiles, that they should repent, turn to God, and do works befitting repentance."
And so forth...