Musnad Ahmad 32:1284

'Abd al-Samad narrated to us, 'Umar ibn Ibrahim narrated to us, Qatadah narrated to us, from Anas, that the Prophet, peace and blessings of Allah be upon him, said: "Allah is more intense in joy at the repentance of His servant than one of you who happens upon his camel, when he had lost it in a desert land." And Shahr narrated that from Abu Hurairah.