For generations, a lamb was slaughtered for our sins to make us acceptable before the Lord. In our generation, Jesus' sacrifice makes those who believe acceptable to God
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Groaning Creation
"For I consider that the sufferings of this present time are not worth comparing with the glory that is to be revealed to us. For the creation waits with eager longing for the revealing of the sons of God. For the creation was subjected to futility, not willingly, but because of him who subjected it, in hope that the creation itself will be set free from its bondage to corruption and obtain the freedom of the glory of the children of God. For we know that the whole creation has been groaning together in the pains of childbirth until now. (Romans 8:18-22)
In more ways than one has creation suffered under the sin of its human element. Thorns and weeds grow more readily than other plants, carnivores seek to kill and eat their weaker prey, and even the strongest among the animal kingdom succumb to human hunting needs and sporting expeditions. Humans often will mistreat animals and randomly destroy God's creation to develop a convenience.
But here in Leviticus, we are are shown the most direct way that Creation groans under the weight of sin, awaiting the full redemption of man. Animals directly paid for the wickedness of man. Its sobering to see how many animals had to die to make temporary atonement for the sins of men and woman for many generations. And here we see God prescribing the sacrifice of bulls, sheep, goats, turtledoves, pigeons all for the sin of people.
Statutory
That these sacrifices are laws of God is affirmed over and over, even in 3:17, " It shall be a statute forever throughout your generations, in all your dwelling places, that you eat neither fat nor blood.” People did not randomly come up with this plan. It was all part of God revealing His plan to His people.
Sacrificial
It may seem an obvious observation, but I'll make it clear here: The animal was dieing on behalf of the sinning men and women.
“Speak to the people of Israel and say to them, When any one of you brings an offering to the Lord, you shall bring your offering of livestock from the herd or from the flock." (1:2)
The animal was compelled to pay the price of a debt it did not incur. This was true of the animals and fulfilled eventually in Jesus Christ:
"For if the blood of goats and bulls, and the sprinkling of defiled persons with the ashes of a heifer, sanctify for the purification of the flesh, how much more will the blood of Christ, who through the eternal Spirit offered himself without blemish to God, purify our conscience from dead works to serve the living God." (Hebrews 9:13-14).
Slaughter
I already wrote on the gruesome nature of the sacrifices offered in a previous blog post, but in Leviticus 1-3, graphic description of the slaughter is given:
"Then he shall kill the bull before the Lord, and Aaron's sons the priests shall bring the blood and throw the blood against the sides of the altar that is at the entrance of the tent of meeting. Then he shall flay the burnt offering and cut it into pieces, and the sons of Aaron the priest shall put fire on the altar and arrange wood on the fire. And Aaron's sons the priests shall arrange the pieces, the head, and the fat, on the wood that is on the fire on the altar; 9 but its entrails and its legs he shall wash with water. And the priest shall burn all of it on the altar, as a burnt offering, a food offering with a pleasing aroma to the Lord." (1:1-9)
The butchering, dismembering and burning of the bull is frankly, offensive. Then there is the throwing the blood all over the altar. During this period, animals were raised for this purpose.
Serious
In these opening pages, the fact that a sacrifice was needed, and that these animals would be the sacrifice created a place of grave seriousness. Look at the death as a result of our sin! This is no laughing matter. Often, we take sin very lightly, but the need for these sacrifices shows how literally deadly serious this matter is. Don't you think that a fledgling nation like Israel could have benefited from the food these animals would have produced rather than this slaughter and burning? How about the extreme labor and resources it took to raise and prepare the animals for this? Further, how about the dedication of God's holy word to this instruction? Any question whether God is serious about the weightiness of sin, and the need for the animal sacrifices? Hebrews 9:22 sums it this way: "Indeed, under the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness of sins." Serious and necessary.
Specific
The prescriptions of which animals to be sacrificed, and exactly how they were sacrificed was very specific. Parts of Leviticus describe the anatomy of an animal with medical precision. Consider:
"And from the sacrifice of the peace offering, as a food offering to the Lord, he shall offer the fat covering the entrails and all the fat that is on the entrails, 4 and the two kidneys with the fat that is on them at the loins, and the long lobe of the liver that he shall remove with the kidneys." (3:3)
The message came across very clear: God is concerned with the specifics of the sacrifices. When we think for a moment that God will lightly consider our own sin, or faults at the day of judgement, we are sorely mistaken. God's detailed concern shown here displays a careful quality of God that should lead us to shudder over our sin. "God doesn't distinguish the details of how I come to him, right?" Yes He does. For you and I, salvation is through Jesus Christ, and Him alone.
Symbolic
All the sacrifices killed were symbolic of the ultimate fulfillment in Christ.
Since the death of Jesus, sacrifices were no longer needed, because they symbolized His perfect sacrifice. And once that was offered once for all, the illustration became obsolete.
As Creation groaned during that time, the intent was to reveal who God was to His people, and bring the weight of sin upon all humanity leading to repentance.