(5) باب الْحَلِفِ بِالآبَاءِ
It was narrated from 'Umar that the Prophet said:
"Allah forbids you to swear by your forefathers." 'Umar said: "By Allah, I never swore by them again, whether saying it for myself or reporting of others." (ID)
Reference (ID): Sunan an-Nasa'i 3767 (ID)
In-book reference (ID): Book 35, Hadith 7 (ID)
English translation (ID): Vol. 4, Book 35, Hadith 3798 (ID)