ʿUbaydullāh b. Saʿīd And Qutaybah b. Saʿīd > Sufyān > al-Zuhrī > Sālim from his father

The Messenger of Allah ﷺ heard me swearing an oath by my father and said: “Allah forbids you to swear by your fathers.” ‘Umar said: By Allah, I never swore by my father after that, whether saying it myself or narrating what someone else had said.

أَخْبَرَنَا عُبَيْدُ اللهِ بْنُ سَعِيدٍ وَقُتَيْبَةُ بْنُ سَعِيدٍ وَاللَّفْظُ لَهُ قَالَا حَدَّثَنَا سُفْيَانُ عَنِ الزُّهْرِيِّ عَنْ سَالِمٍ عَنْ أَبِيهِ قَالَ

سَمِعَ النَّبِيَّ ﷺ عُمَرَ وَهُوَ يَقُولُ وَأَبِي وَأَبِي فَقَالَ «إِنَّ اللهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ» قَالَ عُمَرُ فَوَاللهِ مَا حَلَفْتُ بِهَا بَعْدُ ذَاكِرًا وَلَا آثِرًا