Muhammad bin Ja'far, may Allah have mercy on him, was asked about the vessel into which a dog puts its mouth. He said: Sa'id, may Allah have mercy on him, narrated to me from Ayyub, may Allah have mercy on him, and he from Ibn Sirin, may Allah have mercy on him, that it is narrated from our master Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "It should be washed seven times, the first time with earth."