(4) باب لاَ تَحْلِفُوا بِآبَائِكُمْ
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) met `Umar bin Al-Khattab while the latter was going with a group of camel-riders, and he was swearing by his father. The Prophet (ﷺ) said, "Lo! Allah forbids you to swear by your fathers, so whoever has to take an oath, he should swear by Allah or keep quiet."
Reference: Sahih al-Bukhari 6646
In-book reference: Book 83, Hadith 25
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 641