(5) باب فِي كَرَاهِيَةِ الْحَلِفِ بِالآبَاءِ
Narrated Ibn 'Umar:
The Messenger of Allah (ﷺ) found 'Umar al-Khattab in a caravan while he was swearing by his father. So he said: Allah forbids you to swear by forefathers. If anyone swears, he must swear by Allah or keep silence.
Reference: Sunan Abi Dawud 3249
In-book reference: Book 22, Hadith 8
English translation: Book 21, Hadith 3243