Musannaf Ibn Abi Shayba 1:1273

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hasan ibn Salih, from Ghalib, from Abu Ja’far. And from Layth, from ‘Ata’, regarding a man whose garment is struck by urine and he does not know where it is: They both said: He should wash the entire garment.