Deuteronomy 27:23

23 "'A curse on anyone who has sexual relations with his mother-in-law.' All the people are to say, 'Amen!'

Deuteronomy 27:23 Meaning and Commentary

Deuteronomy 27:23

Cursed [be] he that lieth with his mother in law
See ( Leviticus 18:7 Leviticus 18:8 ) . All these incestuous or brutal copulations may well be supposed to be done in secret: and all the people shall say Amen;
as abhorring such incest.

Deuteronomy 27:23 In-Context

21 "'A curse on anyone who has sexual relations with any kind of animal.' All the people are to say, 'Amen!'

22 "'A curse on anyone who has sexual relations with his sister, no matter whether she is the daughter of his father or of his mother.'All the people are to say, 'Amen!'

23 "'A curse on anyone who has sexual relations with his mother-in-law.' All the people are to say, 'Amen!'

24 "'A curse on anyone who secretly attacks a fellow member of the community.'All the people are to say, 'Amen!'

25 "'A curse on anyone who accepts a bribe to kill an innocent person.' All the people are to say, 'Amen!'