Musnad Ahmad 26:80

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Ibrahim al-Taymi, from al-Harith ibn Suwayd, who said: Abdullah narrated to us two hadiths: one from himself, and the other from the Messenger of Allah, peace and blessings of Allah be upon him. Abdullah said: "Indeed, the believer sees his sins as if he is at the base of a mountain, fearing that it might fall upon him. And the wicked person sees his sins as a fly that landed on his nose, so he said to it like this (gesturing with his hand), and it flew away." He said: And the Messenger of Allah, peace and blessings of Allah be upon him, said: "Allah is more joyful with the repentance of one of you than a man who set out in a desolate, destructive land, with his riding beast carrying his food, his drink, his provisions, and what sustains him. He lost it, so he went out in search of it until death overtook him, and he did not find it. He said: 'I will return to the place where I lost it and die there.' He said: So he came to his place, and his eyes overcame him (he fell asleep). He woke up, and there was his riding beast at his head, with his food, his drink, his provisions, and what sustains him upon it."