حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا عَوْفٌ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ تَحْلِفُوا بِآبَائِكُمْ وَلاَ بِأُمَّهَاتِكُمْ وَلاَ بِالأَنْدَادِ وَلاَ تَحْلِفُوا إِلاَّ بِاللَّهِ وَلاَ تَحْلِفُوا بِاللَّهِ إِلاَّ وَأَنْتُمْ صَادِقُونَ " .
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Narrated Ibn 'Umar
The Messenger of Allah (ﷺ) found 'Umar al-Khattab in a caravan while he was swearing by his father. So he said: Allah forbids you to swear by forefathers. If anyone swears, he must swear by Allah or keep silence.