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Narrated 'Umar:

The Prophet ﷺ said, "If anybody has to take an oath, he should swear only by Allah." The people of Quraish used to swear by their fathers, but the Prophet ﷺ said, "Do not swear by your fathers. "
حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ جَعْفَرٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ أَلاَ مَنْ كَانَ حَالِفًا فَلاَ يَحْلِفْ إِلاَّ بِاللَّهِ ‏"‏‏.‏ فَكَانَتْ قُرَيْشٌ تَحْلِفُ بِآبَائِهَا، فَقَالَ ‏"‏ لاَ تَحْلِفُوا بِآبَائِكُمْ ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 3836
• Sahih al-Bukhari, Vol. 5, Book of Merits of Al-Ansaar, Hadith 177
• Sahih al-Bukhari, Book of Merits of Al-Ansaar, Hadith 177