Is it obligatory to wash dishes, spoons, and knives that have touched pork seven times with water and once with earth, and what is the Hadith upon which this ruling is based, and is it not sufficient to wash them with soap once?

It is forbidden to eat pork, its fat, or any part of it, as Allah Almighty says: "Forbidden to you are carrion, blood, and the flesh of swine" [Quran 5:3]. This is because it is an abomination. Exaggerating in washing dishes from which pork was eaten is sufficient to remove its impurity, and it is not required to wash them seven times, one of which is with earth.