عَنْهُ أَيْضًا قَالَ كُنْتُ مَعَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فِي غَزَاةٍ فَحَلَفْتُ لَا وَأَبِي فَهَتَفَ بِي رَجُلٌ مِنْ خَلْفِي فَقَالَ لَا تَحْلِفُوا بِآبَائِكُمْ فَإِذَا هُوَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ
It is narrated from Sayyiduna Umar (may Allah be pleased with him), who says: I was with the Noble Prophet (peace and blessings be upon him) in a battle. I swore an oath saying: No, by my father! Then someone behind me called out loudly: Do not swear by your forefathers. When I looked, it was the Messenger of Allah (peace and blessings be upon him).