I have given the Levites as a gift to Aaron and to his sons from among the sons of Israel, to perform the service of the sons of Israel at the tent of meeting and to make atonement on behalf of the sons of Israel, so that there will be no plague among the sons of Israel by their coming near to the sanctuary.”

and he went after the man of Israel into the tent and pierced both of them through, the man of Israel and the woman, through the body. So the plague on the sons of Israel was checked.

But Sihon would not permit Israel to pass through his border. So Sihon gathered all his people and went out against Israel in the wilderness, and came to Jahaz and fought against Israel.