Musannaf Ibn Abi Shayba 13:3110

Abu Bakr narrated to us, he said: Yahya ibn Adam narrated to us, he said: Hasan narrated to us, from Ibn Abi Layla, that he said regarding a fuller (launderer): If the owner of the garment sought his help, and he pounded [the garment] with him, and the garment tore, he said: The fuller is liable.