CHAPTER: IT IS FORBIDDEN TO TAKE THE OATHS IN THE NAME OF ANYONE ELSE BESIDES ALLAAH
'Umar b. al-Khattib reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Allaah, the Great and Majestic, forbids you to swear by your fathers. Umar said: By Allaah. I have never sworn (by my father) since I heard Allaah's Messenger (sallAllaahu alayhi wa sallam) forbidding it mentioning them" on my behalf" nor on behalf of someone else.
This hadith has been transmitted on the authority of Zuhri except that in the hadith narrated on the authority of Uqail the words are:" I did not take oath by (anyone else except Allaah) since I heard Allaah's Messenger forbidding it. nor did I speak in such terms, and the narrator did not say," on my own behalf or on behalf of someone else".
Salim reported on the authority of his father that Allaah's Prophet (sallAllaahu alayhi wa sallam) heard 'Umar while he was taking oath by his father. The rest of the hadith is the same.
'Abdullah (b. Umar) reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) found, Umar b. al-Khattab amongst the riders and he was taking oath by his father Allaah's Messenger (sallAllaahu alayhi wa sallam) called them (saying) ; Our Allaah, the Exated and Majestic, has forbidden you that you take oath by your father. He who bag to take an oath, he must take it by Allaah or keep quiet.
This hadith is narrated on the authority of Ibn Umar through another chain of transmitters.
Ibn 'Umar heard Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: He who has to take an oath, he must not take oath but by Allaah. The Quraish used to take oath by their fathers. So he (the Prophet) said: Do not take oath by your fathers.