(1) باب
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.'" (DE)
Reference (DE): Sunan an-Nasa'i 3761 (DE)
In-book reference (DE): Book 35, Hadith 1 (DE)
English translation (DE): Vol. 4, Book 35, Hadith 3792 (DE)