Musannaf Ibn Abi Shayba 13:2314

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, from Aban ibn Yazid, he said: Abu Abdullah al-Sahmari narrated to us that Ibn Umar was asked about the earnings of a street sweeper. He said: "It is foul, the earnings are foul, the food is foul, and the clothing is foul."