Salim bin Abdullah narrates from his father: The Prophet Muhammad (peace be upon him) heard Sayyiduna Umar (may Allah be pleased with him) swearing by his father. So he said: Beware! Allah Almighty has forbidden you from swearing by your forefathers. Sayyiduna Umar (may Allah be pleased with him) says: By Allah! After that, I never swore by (the name of) my forefathers, neither intentionally nor by mistake.

Imam Humaydi (may Allah have mercy on him) says: Sufyan narrated this statement. I heard Muhammad bin Abdur Rahman saying: Those who had great mastery over the Arabic language used to say: The words of the narration «ولا آثرا» mean that I did not let anyone else do so either, about whom it was reported that he had sworn such an oath.