Acts 3:19
Therefore, you people [must] repent [i.e., change your hearts and lives] and turn [back] again [to God] so that your sins will be blotted out and so that you may enjoy times of [spiritual] refreshment from the presence of the Lord [i.e., through the indwelling of the Holy Spirit].
Acts 26:20
but, [instead] declared to the people of Damascus first, [then] to the people of Jerusalem, and [finally to those] throughout all of the district of Judea, as well as to the Gentiles [everywhere] that they should repent [i.e., change their hearts and lives] and turn to God, doing deeds which demonstrate their repentance.
1 Corinthians 7:19
Being circumcised does not matter [with God], nor does being uncircumcised matter [either]. But observing God's commands is what matters.