Deuteronomy 24:4
then her former husband, who sent her away, may not take her again to be his wife, after she has been defiled, for that is an abomination before the LORD. And you shall not bring sin upon the land that the LORD your God is giving you for an inheritance.
Jeremiah 3:1
"If a man divorces his wife and she goes from him and becomes another man's wife, will he return to her? Would not that land be greatly polluted? You have played the whore with many lovers; and would you return to me? declares the LORD.
Leviticus 18:24-28
"Do not make yourselves unclean by any of these things, for by all these the nations I am driving out before you have become unclean,
Joshua 22:17-18
Have we not had enough of the sin at Peor from which even yet we have not cleansed ourselves, and for which there came a plague upon the congregation of the LORD,