Bulugh al-Maram, Book 13, Hadith 6 (In-Book) ⓘ
Narrated Ibn Umar (RA): The Prophet's oath used to be: "No, by Him Who turns (changes) the hearts." [Reported by al-Bukhari].
وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { كَانَتْ يَمِينُ اَلنَّبِيِّ - صلى الله عليه وسلم - "لَا, وَمُقَلِّبِ اَلْقُلُوبِ" } رَوَاهُ اَلْبُخَارِيُّ 1. 1 - صحيح رواه البخاري (6628).
also referenced under: Book 13, Hadith 1379 (English)