حَدَّثَنَا سُفْيَانُ عَنْ إِسْمَاعِيلَ بْنِ أُمَيَّةَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَدْرَكَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عُمَرَ وَهُوَ فِي بَعْضِ أَسْفَارِهِ وَهُوَ يَقُولُ وَأَبِي وَأَبِي فَقَالَ إِنَّ اللَّهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ فَمَنْ كَانَ حَالِفًا فَلْيَحْلِفْ بِاللَّهِ وَإِلَّا فَلْيَصْمُتْ
مسند امام احمد بن حنبل · Hadith 4593
It was narrated from Ibn 'Umar (that) the Messenger of Allah (PBUH) caught up with 'Umar, during one of his journeys, when he was saying: By my father, by my father. He (the Prophet (PBUH)) said: "Allah forbids you to swear by your fathers. Whoever wants to swear, let him swear by Allah or else remain silent."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020