The Book Pertaining to Repentance and Exhortation to Repentance (Kitab Al-Tauba)
Muslim :: Book 37 : Hadith 6613
Harith b. Suwaid said: I went to see 'Abdullah to inquire about his health as he was sick and he narrated to us a hadith of Allahs Messenger (may peace be upon him). He heard Allah's Messenger (may peace be upon him) as saying: Allah is more pleased with the repentance of His believing servant than a person who loses his riding beast carrying food and drink. He sleeps (being disappointed of its recovery) and then gets up and goes in search for that, until he is stricken with thirst. then comes back to the place where he had been before and goes to sleep completely exhausted placing his head upon his hands waiting for death. And when he gets up, lot there is before him his riding beast and his provisions of food and drink. Allah is more pleased with the repentance of His servant than the recovery of this riding beast along with the provisions (of food and drink).