It is narrated with the same chain that Hazrat Sa'd bin 'Ubadah (may Allah be pleased with him) submitted, "O Messenger of Allah (peace and blessings be upon him), if I see a strange man with my wife in an inappropriate situation, should I leave him and first go to find four witnesses?" The Noble Prophet (peace and blessings be upon him) said, "Yes!" (Later, this ruling was changed with the law of li'an, the details of which are mentioned in the first section of Surah An-Nur.)