God's old covenant with the people of Israel was a temporal one based on the works of man. The New Covenant through Christ is a much more excellent covenant. It is an everlasting covenant based on the finished work of Christ on the Cross. It is not something we do or follow, but changes who we are. Christ's single sacrifice cleanses us for all time from past, present and future sin. Don't fall back into an old covenant way of thinking where you try to earn your holiness and God's acceptance through works.