It is narrated from Sayyidah Asma' bint Yazid (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) recited this verse: "Say: O My servants who have transgressed against themselves, do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Most Forgiving, the Most Merciful." [Surah al-Zumar: 53]
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20782