אָר֕וּר שֹׁכֵ֖ב עִם־חֹֽתַנְתּ֑וֹ וְאָמַ֥ר כָּל־הָעָ֖ם אָמֵֽן׃ (ס)
Cursed be he that lieth with his mother-in-law. And all the people shall say: Amen.
Targum Jonathan on Deuteronomy
Accursed is he who shall lie with his mother-in-law. And all shall answer together, and say, Amen.