حَدَّثَنَا وَكِيعٌ حَدَّثَنَا سُفْيَانُ عَنْ مُوسَى قَالَ وَكِيعٌ نَرَى أَنَّهُ ابْنُ عُقْبَةَ عَنْ سَالِمٍ عَنِ ابْنِ عُمَرَ قَالَ كَانَ يَمِينُ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الَّتِي يَحْلِفُ عَلَيْهَا لَا وَمُقَلِّبِ الْقُلُوبِ
مسند امام احمد بن حنبل · Hadith 4788
It was narrated that Ibn 'Umar said: The oath of the Prophet (PBUH) by which he swore was: "No, by the Controller of the hearts.”
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020