the Messenger of Allah ﷺ heard him swearing by his father. The Messenger of Allah ﷺ said: 'Allah forbids you from making oaths by your forefathers." 'Umar said: I never took an oath by them (i.e., my forefathers) myself nor narrating such words from anyone else.”  

أَنَّ رَسُولَ اللَّهِ ﷺ سَمِعَهُ يَحْلِفُ بِأَبِيهِ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ قَالَ عُمَرُ فَمَا حَلَفْتُ بِهَا ذَاكِرًا وَلاَ آثِرًا  

the Messenger of Allah ﷺ said: 'Do not take oaths by idols nor by your forefathers. "  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ تَحْلِفُوا بِالطَّوَاغِي وَلاَ بِآبَائِكُمْ  

the Messenger of Allah ﷺ said: "Whoever takes an oath, and swears, saying: 'By Al-Lat and Al-Uzza,' let him say:'La ilaha illallah.' "  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ حَلَفَ فَقَالَ فِي يَمِينِهِ بِاللاَّتِ وَالْعُزَّى فَلْيَقُلْ لاَ إِلَهَ إِلاَّ اللَّهُ  

"I took an oath by Lat and 'Uzza. The Messenger of Allah ﷺ said : 'Say: "La ilaha illallah wahdahu la sharika lahu" (None has the right to be worshipped but Allah alone, with no partner or associate)," then spit toward your left three times, and seek refuge with Allah, and do not do that again."'  

رَسُولُ اللَّهِ ﷺ قُلْ لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ ثُمَّ انْفُثْ عَنْ يَسَارِكَ ثَلاَثًا وَتَعَوَّذْ وَلاَ تَعُدْ