It happened on the seventh day, that they rose early at the dawning of the day, and compassed the city after the same manner seven times: only on the day they compassed the city seven times.
One result of moral filth is physical disease. Therefore, the destruction of the Canaanites (in some cases together with their sheep and cattle) ensured the removal of deadly diseases that could have threatened Israel’s existence. The absence of Canaanite religious practices would also be a help to Israel’s religious life and moral well-being.