Deuteronomy 4:1-3 New King James Version (NKJV)
Moses Commands Obedience
4 “Now, O Israel, listen to the statutes and the judgments which I teach you to observe, that you may live, and go in and [a]possess the land which the Lord God of your fathers is giving you. 2 You shall not add to the word which I command you, nor take from it, that you may keep the commandments of the Lord your God which I command you. 3 Your eyes have seen what the Lord did at Baal Peor; for the Lord your God has destroyed from among you all the men who followed Baal of Peor.