حَدَّثَنَا أَبُو سَعِيدٍ حَدَّثَنَا إِسْرَائِيلُ حَدَّثَنَا سَعِيدُ بْنُ مَسْرُوقٍ عَنْ سَعْدِ بْنِ عُبَيْدَةَ عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُ عَنْ عُمَرَ أَنَّهُ قَالَ لَا وَأَبِي فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَهْ إِنَّهُ مَنْ حَلَفَ بِشَيْءٍ دُونَ اللَّهِ فَقَدْ أَشْرَكَ
مسند امام احمد بن حنبل · Hadith 329
It was narrated from Sa'd bin 'Ubaidah, from Ibn 'Umar, that 'Umar (RA) said: No, by my father. The Messenger of Allah (PBUH) said: "Stop it! Whoever swears by anything other than Allah has committed an act of shirk."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020