It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Prophet Muhammad, peace and blessings be upon him, said: "When a dog puts its mouth into the utensil of any one of you, its purification is that it should be washed seven times. The first time with soil. (It should be cleaned)." In the narration of Duraqi it is « اولھا بتراب » and in the narration of Qat'i it is « اولھا بالتراب »." The first time with soil." (Both have the same meaning.)