4 And Moses wrote all the words of the Lord, and rose up early in the morning, and builded an altar under the hill, and twelve pillars, according to the twelve tribes of Israel.

5 And he sent young men of the children of Israel, which offered burnt offerings, and sacrificed peace offerings of oxen unto the Lord.

6 And Moses took half of the blood, and put it in basins; and half of the blood he sprinkled on the altar.

7 And he took the book of the covenant, and read in the audience of the people: and they said, All that the Lord hath said will we do, and be obedient.

8 And Moses took the blood, and sprinkled it on the people, and said, Behold the blood of the covenant, which the Lord hath made with you concerning all these words.

The Israelites had committed to following God’s law, and this covenant was sealed by making solemn sacrifice. Every tribe had their own altar, and all of them ritually dedicated themselves to following the word that God had given.

Let’s take the time to be specific about exactly what those rituals were, and what their significance was. There are three rituals being described here.

1. The burnt offering. The formal description of how this offering was to be made is given in Leviticus 1.
   • Performance: The Israelite who was making the sacrifice would give up an entire animal which would be cut into parts, cleaned, and then the entire thing was burned on the altar.
   • Significance: This was a constant and regular sacrifice in the Israelite tradition. The burning of the entire animal obviously represents the giving of the whole self to the Lord, turning one’s entire life to His will. It is therefore a fitting symbol for those who are ready to make penance for past transgressions and willing to commit themselves back to the Lord.
2. The peace offering. The initial description of this offering can be found in Leviticus 3, though there are some details that are only explained later, such as in Leviticus 19:5-8 and Deuteronomy 27:7.
   • Performance: The Israelite would once again offer up an entire animal. This time, though, only the fat and specific organs would be laid on the altar and burned. The rest would become a meal that the Israelite would eat that day and the next, with any leftovers being burned upon the third day.
   • Significance: This was a sign of fellowship and friendship. The Israelite making the offering would essentially be sharing a meal with the Lord. The Lord’s part of the meal came from what was burned on the altar, the Israelite’s part from eating the remaining flesh. Also of note was that the parts burned on the altar were forbidden for the Israelites to eat anyway (fat and blood), so God was taking the portion that was not right for the Israelites and leaving for them what was good, just as He takes from us our sin and leaves us with a new heart. This sacrifice is a fitting symbol for those who are living in union and harmony with God, sharing a life and a purpose with Him.
3. The sprinkling of blood. Some of the most thorough details of this ritual are actually the ones given here in these verses. However, there are some additional details of this event included in Hebrews 9:19-22.
   • Performance: This ritual was attached to the other sacrifices. There is no sprinkling of blood without the burnt and peace offerings. The priest would take the blood from the offerings, mix it with water, and divide it in two. Half he would sprinkle over the altar, its instruments, and even the book of the law, and the other half would be sprinkled upon the person(s) making the offering.
   • Significance: The blood was sprinkled over the instruments and word of God, and also upon the people. It covers them both, binds them together, and seals their covenant. In Hebrews 9 the assertion is made that every testament/covenant requires the death of the testator to be in full force. Frankly, that is a logic I don’t understand at this point. I don’t yet know what fundamental, universal truth makes it so that death is necessary to empower a commitment, but apparently there is one, and so that sprinkled blood was the activating agent in the covenant between God and His people.

Taken as a whole, we can see that Israel was sacrificing their old lives and giving themselves wholeheartedly to God by the burnt offering. Then they were recognized as His partners and shared meal with Him via the peace offering. Finally, this new union was sanctified by the sprinkling of the blood.

These were not random rituals, each one served a function and a purpose, with deep spiritual meaning behind them. They were being used to properly initiate God’s people.