The young men the spies went in, and brought out Rahab, and her father, and her mother, and her brothers, and all that she had; all her relatives also they brought out; and they set them outside of the camp of Israel.
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.