Deuteronomy 4:2-4

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. 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. But you who held fast to the LORD your God are alive today, every one of you.