From this father (Ibn Umar) who said: "The Messenger of Allah (ﷺ) often would swear with this oath: 'No! By the Changer of the Hearts.'"
Jami` at-Tirmidhi Book 20, Hadith 19
← Previous Hadith "I said:'O Messenger of Allah! I had vowed to perform I'tikaf in Al-Masjid Al-Haram for a night during the era of Jahiliyyah.' He said: 'Fulfill your vow.''"

Jami` at-Tirmidhi Book 20, Hadith 18 Next Hadith → "I heard the Messenger of Allah (ﷺ) saying: 'Whoever frees a believing slave, then Allah frees a limb from the Fire for each of his limbs, such that he frees his private parts in lieu of his private parts.'"

Jami` at-Tirmidhi Book 20, Hadith 20