13 by sleeping with another man, and it is concealed from her husband and her impurity is undetected (since there is no witness against her and she was not caught in the act),
Numbers 5:13 Cross References - BSB
Leviticus 18:20
20 You must not lie carnally with your neighbor’s wife and thus defile yourself with her.
Leviticus 20:10
10 If a man commits adultery with another man’s wife—with the wife of his neighbor—both the adulterer and the adulteress must surely be put to death.
Proverbs 7:18-19
Proverbs 30:20
20 This is the way of an adulteress: She eats and wipes her mouth and says, ‘I have done nothing wrong.’