Commentaries:
Jamieson, Fausset, and Brown
then he shall number to himself seven days for his cleansing—Like a leprous person he underwent a week's probation, to make sure he was completely healed. Then with the sacrifices prescribed, the priest made an atonement for him, that is, offered the oblations necessary for the removal of his ceremonial defilement, as well as the typical pardon of his sins.
Other Jamieson, Fausset, and Brown entries containing Leviticus 15:13:
Numbers 6:9-12
Numbers 31:19-24
Jude 1:23
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