Allah, the Great and Majestic, forbids you to swear by your fathers. Umar said: By Allah. I have never sworn (by my father) since I heard Messenger of Allah ﷺ forbidding it mentioning them" on my behalf" nor on behalf of someone else.  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ اللَّهَ ﷻ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ قَالَ عُمَرُ فَوَاللَّهِ مَا حَلَفْتُ بِهَا مُنْذُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ نَهَى عَنْهَا ذَاكِرًا وَلاَ آثِرًا  

" I did not take oath by (anyone else except Allah) since I heard Messenger of Allah forbidding it. nor did I speak in such terms, and the narrator did not say," on my own behalf or on behalf of someone else".  

عَنِ الزُّهْرِيِّ بِهَذَا الإِسْنَادِ مِثْلَهُ غَيْرَ أَنَّ فِي حَدِيثِ عُقَيْلٍ مَا حَلَفْتُ بِهَا مُنْذُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَنْهَى عَنْهَا وَلاَ تَكَلَّمْتُ بِهَا وَلَمْ يَقُلْ ذَاكِرًا وَلاَ آثِرًا  

Salim reported on the authority of his father that Allah's Apostle ﷺ heard 'Umar while he was taking oath by his father. The rest of the hadith is the same.  

سَمِعَ النَّبِيُّ ﷺ عُمَرَ وَهُوَ يَحْلِفُ بِأَبِيهِ بِمِثْلِ رِوَايَةِ يُونُسَ وَمَعْمَرٍ  

'Abdullah (b. Umar) reported that Messenger of Allah ﷺ found, Umar b. al-Khattab amongst the riders and he was taking oath by his father Messenger of Allah ﷺ called them (saying) ; Our Allah, the Exated and Majestic, has forbidden you that you take oath by your father. He who bag to take an oath, he must take it by Allah or keep quiet.  

عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ أَدْرَكَ عُمَرَ بْنَ الْخَطَّابِ فِي رَكْبٍ وَعُمَرُ يَحْلِفُ بِأَبِيهِ فَنَادَاهُمْ رَسُولُ اللَّهِ ﷺ أَلاَ إِنَّ اللَّهَ ﷻ يَنْهَاكُمْ أَنْ تَحْلِفُوا بِآبَائِكُمْ فَمَنْ كَانَ حَالِفًا فَلْيَحْلِفْ بِاللَّهِ أَوْ لِيَصْمُتْ  

This hadith is narrated on the authority of Ibn Umar through another chain of transmitters.  

عَنِ النَّبِيِّ ﷺ  

He who has to take an oath, he must not take oath but by Allah. The Quraish used to take oath by their fathers. So he (the Holy Prophet) said: Do not take oath by your fathers.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ كَانَ حَالِفًا فَلاَ يَحْلِفْ إِلاَّ بِاللَّهِ وَكَانَتْ قُرَيْشٌ تَحْلِفُ بِآبَائِهَا فَقَالَ لاَ تَحْلِفُوا بِآبَائِكُمْ