Al-Lu'lu Wal-Marjan 956 — The Book of Al-Li'ân (An oath taken by both the wife and the husband when he accuses his wife for committing illegal sexual intercourse [refer the Qur'ân (V.24:6)]

Al-Mughira Narrated from:

Sa'd bin 'Ubâda said, "If I saw a man with my wife, I would strike him (behead him) with the blade of my sword." This news reached Allâh's Messenger ﷺ who then said, "Your people are astonished at Sa'd's Ghîra. [1] By Allâh, I have more Ghîra than him, and Allâh has more Ghîra than me, and because of Allâh's Ghîra, He has made unlawful shameful deeds and sins (illegal sexual intercourse etc.) done in open and in secret.And, there is none who likes that the people should repent to Him and beg His pardon than Allâh, and for this reason He sent the warners and the Mubashshirîn (givers of glad tidings). And there is none who likes to be praised more than Allâh does, and for this reason, Allâh promised to grant Paradise (to the doers of good)." ( Sahîh Al-Bukhârî, Hadîth No. 512, Vol. 9)