The Old Testament was the law of God for the Israelites. In Deuteronomy 4:44 and 5:1, Moses makes it clear that the law was for the 12 tribes of Israel. It was not for any other people, except that some laws applied to those who would live with the Israelites (Numbers 15:29).
The Old Testament was never the law for Gentiles and today it is not even God’s law for the Jews. We must not try to take the laws in the Old Testament as the laws that God wants us to follow today. In Colossians 2:13-17, Paul makes it clear the Old Testament has been nailed to the cross. Because of that, no one is bound to keep the feast days, the Sabbath day, or anything else in the Old Testament. We must not try to make it our law today. Discussing how the priesthood changed from Levi to Judah when Christ became our high priest, the Hebrew writer states,
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For when there is a change in the priesthood, there is necessarily a change in the law as well (Hebrews 7:12). The book of Hebrews is written to encourage the Jews to keep following the law of Christ and not go back to the Old Law which had finished its usefulness as a law.