Sanctify yourselves. As they had done when they met the Lord at Sinai (Ex. 19:10). The external cleansing there enjoined was to be symbolic of the inner cleansing. Times of peculiar danger and calamity should be seasons of heart searching and earnest reformation. The heart searching here commanded gave Achan a unique opportunity to reconsider and acknowledge his crime. But sin has a peculiar way of hardening men’s hearts and lessening their abhorrence of it. Not until forced to do so did Achan acknowledge his guilt, and even then not in the true spirit of repentance. He probably flattered himself that others were equally as guilty as he. A guilty person often holds others to be guilty of the same act he habitually commits.