Original Verse:
Acts Chapter 3 Verse 19"Repent therefore, and turn again, that your sins may be blotted out, so that there may come times of refreshing from the presence of the Lord,

Reference Verses:
Acts Chapter 2 Verse 38Peter said to them, "Repent, and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of sins, and you will receive the gift of the Holy Spirit.
Matthew Chapter 3 Verse 2"Repent, for the Kingdom of Heaven is at hand!"
Psalms Chapter 51 Verse 1Have mercy on me, God, according to your loving kindness. According to the multitude of your tender mercies, blot out my transgressions.
Acts Chapter 26 Verse 20but declared first to them of Damascus, at Jerusalem, and throughout all the country of Judea, and also to the Gentiles, that they should repent and turn to God, doing works worthy of repentance.
Acts Chapter 20 Verse 21testifying both to Jews and to Greeks repentance toward God, and faith toward our Lord Jesus.