The Prophet’s oath (sallallahu alayhi wa sallam) used to be: “No, by Him Who turns (changes) the hearts.”.
وَعَنْ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا
قَالَ: «كَانَتْ يَمِينُ اَلنَّبِيِّ (صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ) «لَا، وَمُقَلِّبِ اَلْقُلُوبِ»
The Prophet’s oath (sallallahu alayhi wa sallam) used to be: “No, by Him Who turns (changes) the hearts.”.
صحيح رواه البخاري (6628)
Who passed it on, from Ibn Hajar back to the one who was there.
The same words, in another collection.
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