(3) باب كَيْفَ كَانَتْ يَمِينُ النَّبِيِّ صلى الله عليه وسلم
Narrated Ibn `Umar:
The oath of the Prophet (ﷺ) used to be: "No, by Him who turns the hearts."
Reference: Sahih al-Bukhari 6628
In-book reference: Book 83, Hadith 8
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 624