Malik related to me from Suhayl ibn Abi Salih from his father
from Abu Hurayra that Sad ibn Ubada said to the Messenger of Allah,
may Allah bless him and grant him peace, "What do you think I should
do if I were to find a man with my wife? Should I leave him there
until I had brought four witnesses?" The Messenger of Allah, may Allah
bless him and grant him peace, said, "Yes."
Muwatta Malik Book 41, Hadith 7