Sunan an Nasai
3362
Daif+2

It was narrated from An-Nu'man bin Bashir that the Messenger of Allah said, concerning a man who had intercourse with his wife's slave woman:"If she let him do that, I will flog him with one hundred stripes, and if she did not let him do that, I will stone him (to death)

DaifAbu Ghuddah
DaifAl-Albani