مُوَطَّأُ مَالِكٍ
Muwatta Malik 1027
Vows and Oaths
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَدْرَكَ عُمَرَ بْنَ الْخَطَّابِ - رضى الله عنه - وَهُوَ يَسِيرُ فِي رَكْبٍ وَهُوَ يَحْلِفُ بِأَبِيهِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِنَّ اللَّهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ فَمَنْ كَانَ حَالِفًا فَلْيَحْلِفْ بِاللَّهِ أَوْ لِيَصْمُتْ .
Yahya related to me from Malik from Nafi from Abdullah ibn Umar that one time the Messenger of Allah, (ﷺ), was speaking to Umar ibn al-Khattab while he was travelling with a troop and Umar swore by his father and he (the Messenger) said, "Allah forbids you to swear by your fathers. If anyone swears, let him swear by Allah or keep silent."
Arabic/English book reference: Book 22, Hadith 14