Repent &saved by Grace are tied together. Repent is changing from walking in sin to going forward as a new person no longer walking in sin. Sin is defined in scripture as walking forward outside of God’s Law, that is breaking any one of God’s laws. Repent is a continuous way of walking right up to one’s death. No one can earn Salvation by the way they walk, but all are Judged by the way they walk. If the LORD finds them acceptable by the way they walked, He then extends Salvation to them as a gift, Grace. The first command given to us from Yeshua is to live by every word of God, that is a quote He made from Deu. Only the Old Testament existed when Yeshua walked among us on earth. If you can think with logic, that says the complete Bible, Old & New Testaments apply equally today. One Bible, All of the word of God. Mat 5:7-9 is important scripture as it tells one how all will be Judged.