Sunan an-Nasa'i 3761
سنن النسائي#3761Sahihأَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ الرُّهَاوِيُّ، وَمُوسَى بْنُ عَبْدِ الرَّحْمَنِ، قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَتْ يَمِينٌ يَحْلِفُ عَلَيْهَا رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ وَمُقَلِّبِ الْقُلُوبِ " .
It was narrated that Ibn 'Umar said:"The oath by which the Messenger of Allah used to swear was: 'No, by the Controller of the hearts
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 35:1