14 And he brought the bullock for the sin offering: and Aaron and his sons laid their hands upon the head of the bullock for the sin offering.

15 And he slew it; and Moses took the blood, and put it upon the horns of the altar round about with his finger, and purified the altar, and poured the blood at the bottom of the altar, and sanctified it, to make reconciliation upon it.

16 And he took all the fat that was upon the inwards, and the caul above the liver, and the two kidneys, and their fat, and Moses burned it upon the altar.

17 But the bullock, and his hide, his flesh, and his dung, he burnt with fire without the camp; as the Lord commanded Moses.

Now that the priests are washed and anointed, Moses begins a series of sacrifices. Each one of these represents a different aspect, a sequence to make Aaron and his sons ready for their sacred call. The first, unsurprisingly, is the sin offering. As we have seen, this was an atonement for sins committed, a purging of the baser things, a returning to that which was obedient and godly.

Very often we seem to think of atonement for sin as the end of the journey to God, but in fact it is only the beginning. Or perhaps it is both a beginning and an end. It is the end of the journey of sin, but only the beginning of our walk with the Almighty.

As we will seeing in the following verses, the sin offering will be followed by further sacrifices that represent further commitments, covenants, and preparations. So it is meant to be with us. Like Aaron and his sons, our sins are atoned for so that we may then do something with that clean slate. We are forgiven, so that we may become the hands of the Lord. All who accept the cleansing blood of Christ are given a calling. Something that is unique, something that is specially chosen for them by the Lord. To not listen for that calling, or to not answer it, is to deny the true nature of our relationship with God.