Sahih Muslim Book 37, Hadith Number 6616.

Chapter : Exhortation for repentance.

Nu’man b. Bashir reported: Allah is more pleased with the repentance of a believing servant than of a person who set out on a journey with a provision of food and drink on the back of his camel. He went on until he came to a waterless desert and he felt like sleeping. So he got down under the shade of a tree and was overcome by sleep and his camel ran away. As he got up he tried to see (the camel) standing upon a mound, but did not find it. He then got upon the other mound, but could not see anything. He then climbed upon the third mound but did not see anything until he came back to the place where he had been previously. And as he was sitting (in utter disappointment) there came to him the camel, till that (camel) placed its nose-string in his hand. Allah is more pleased with the repentance of His servant than the person who found (his lost camel) in this very state. Simak reported that Sha’bi was of the opinion that Nu’min traced it to Allah’s Apostle (may peace be upon him). Simak, however, did not hear that himself.