Narrated Ibn `Umar: I heard `Umar saying, "Allah's Messenger (ﷺ) said to me, 'Allah forbids you to swear by your fathers." `Umar said, "By Allah! Since I heard that from the Prophet (ﷺ) , I have not taken such an oath, neither intentionally, nor by reporting the oath of someone else."

Narrated Ibn `Umar: I heard `Umar saying, "Allah's Messenger (ﷺ) said to me, 'Allah forbids you to swear by your fathers." `Umar said, "By Allah! Since I heard that from the Prophet (ﷺ) , I have not taken such an oath, neither intentionally, nor by reporting the oath of someone else."

حَدَّثَنَا سَعِيدُ بْنُ عُفَيْرٍ، حَدَّثَنَا ابْنُ وَهْبٍ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، قَالَ قَالَ سَالِمٌ قَالَ ابْنُ عُمَرَ سَمِعْتُ عُمَرَ، يَقُولُ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّ اللَّهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ ‏"‏‏.‏ قَالَ عُمَرُ فَوَاللَّهِ مَا حَلَفْتُ بِهَا مُنْذُ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم ذَاكِرًا وَلاَ آثِرًا‏.‏ قَالَ مُجَاهِدٌ ‏{‏أَوْ أَثَرَةٍ مِنْ عِلْمٍ‏}‏ يَأْثُرُ عِلْمًا‏.‏ تَابَعَهُ عُقَيْلٌ وَالزُّبَيْدِيُّ وَإِسْحَاقُ الْكَلْبِيُّ عَنِ الزُّهْرِيِّ‏.‏ وَقَالَ ابْنُ عُيَيْنَةَ وَمَعْمَرٌ عَنِ الزُّهْرِيِّ عَنْ سَالِمٍ عَنِ ابْنِ عُمَرَ سَمِعَ النَّبِيُّ صلى الله عليه وسلم عُمَرَ‏.‏