Narrated Asma bint Yazid:
"I heard the Messenger of Allah (ﷺ) reciting: 'Say: "O My slaves who have transgressed against themselves! Despair not of the mercy of Allah, verily, Allah forgives all sins and I do not mind (referring to 39:53)." (IT)
English reference (IT): Vol. 5, Book 44, Hadith 3237 (IT)
Arabic reference (IT): Book 47, Hadith 3545 (IT)