The Book of Oaths (Kitab Al-Aiman)

Muslim :: Book 15 : Hadith 4035

'Umar b. al-Khattib reported Allah's Messenger (may peace be upon him) as saying: Allah, the Great and Majestic, forbids you to swear by your fathers. Umar said: By Allah. I have never sworn (by my father) since I heard Allah's Messenger (may peace be upon him) forbidding it mentioning them" on my behalf" nor on behalf of someone else.