Deuteronomy 10:4

10:4 The Lord then wrote on the tablets the same words, the ten commandments, which he had spoken to you at the mountain from the middle of the fire at the time of that assembly, and he gave them to me.

Deuteronomy 24:4

24:4 her first husband who divorced her is not permitted to remarry her after she has become ritually impure, for that is offensive to the Lord. You must not bring guilt on the land which the Lord your God is giving you as an inheritance.