The sin offering was offered to put an end to the separation between God and man that was the result of sin. Though our sin defiles us, it also makes unclean the place where God's presence dwells. This offering purifies it once more so that God can dwell among his people. In Christ, this means that his sacrifice doesn't just forgive us of our sins but purifies our soul so that God might dwell in us. - Leviticus 4:1-5:13