حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ حَدَّثَنَا زُهَيْرٌ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ عَنْ عُمَرَ بْنِ الْخَطَّابِ أَنَّ رَسُولَ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ أَدْرَکَهُ وَهُوَ فِي رَکْبٍ وَهُوَ يَحْلِفُ بِأَبِيهِ فَقَالَ إِنَّ اللَّهَ يَنْهَاکُمْ أَنْ تَحْلِفُوا بِآبَائِکُمْ فَمَنْ کَانَ حَالِفًا فَلْيَحْلِفْ بِاللَّهِ أَوْ لِيَسْکُتْ
سنن ابودوٗد · Hadith 3249
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.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020