Musnad Ahmad 1304:36

Hajjaj ibn Muhammad narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Thabit al-Bunani, from Shahr ibn Hawshab, from Asma bint Yazid, who said: I heard the Prophet, peace and blessings of Allah be upon him, reciting: "O My servants who have transgressed against themselves, do not despair of the mercy of Allah. Indeed, Allah forgives all sins," and he added, "and He does not care," "Indeed, it is He who is the Forgiving, the Merciful."