Exodus 29;10 says, And thou shalt cause a bullock to be brought before the tabernacle of the congregation: and Aaron and his sons shall put their hands upon the head of the bullock.  Then verse eleven adds, And thou shalt kill the bullock before the LORD, by the door of the tabernacle of the congregation.  Aaron and his sons were to put their hands on the head of the bullock, and it was to be killed before the LORD by the door of the tabernacle.  I believe this was to symbolize Aaron and his sons dying, or being sacrificed to God.  The bullock would take their place in sacrifice before God, just as Christ takes our place in sacrifice before God.  Verse twelve states, And thou shalt take of the blood of the bullock, and put it upon the horns of the altar with thy finger, and pour all the blood beside the bottom of the altar.  Some of the blood was to be put on the horns of the altar, and the rest was to be poured at the bottom of the altar.  Basically, the altar was to be covered by the blood of the bullock from the top to the bottom, just as we today as followers of Christ are completely covered by His blood.  Verse thirteen says, And thou shalt take all the fat that covereth the inwards, and the caul that is above the liver, and the two kidneys, and the fat that is upon them, and burn them upon the altar,  Some of the organs of the bullock were to be burned on the altar.  Verse fourteen adds, But the flesh of the bullock, and his skin, and his dung, shalt thou burn with fire without the camp: it is a sin offering.   The rest of the bullock was to be burned outside the camp as a sin offering.  We cannot come to God without our sins being atoned for, and by having faith in Christ is the only way this can happen.  Verse fifteen states, Thou shalt also take one ram; and Aaron and his sons shall put their hands upon the head of the ram.  Then verse sixteen adds, And thou shalt slay the ram, and thou shalt take his blood, and sprinkle it round about upon the altar.   As with the bullock, Aaron and his sons were to put their hands on the head of one of the rams and it was to be slain.  Then the blood was to be sprinkled around the altar.  Verse seventeen says,  And thou shalt cut the ram in pieces, and wash the inwards of him, and his legs, and put them unto his pieces, and unto his head.  Then verse eighteen adds,  And thou shalt burn the whole ram upon the altar: it is a burnt offering unto the LORD: it is a sweet savour, an offering made by fire unto the LORD.  The whole ram after it was cleansed to be burned on the altar as a sacrifice to the LORD.  I believe that we can say that like the ram, Christ sacrificed Himself fully on the cross to atone for our sins.  Verse nineteen states,
And thou shalt take the other ram; and Aaron and his sons shall put their hands upon the head of the ram.  Verse twenty adds, Then shalt thou kill the ram, and take of his blood, and put it upon the tip of the right ear of Aaron, and upon the tip of the right ear of his sons, and upon the thumb of their right hand, and upon the great toe of their right foot, and sprinkle the blood upon the altar round about.  Aaron and his sons were to place their hands on the head of the other ram, and it was to be killed.  Some of the blood of the ram was to be put on the right ear of Aaron and his sons and some on their thumb of their right hand and on the big toe of their right foot.  I believe this was to symbolize being completely covered by the blood.  The rest of the blood was to be sprinkled on the altar.  We can say that as followers of Christ, we are completely covered by His blood shed for us on the cross.  Verse twenty-one concludes, And thou shalt take of the blood that is upon the altar, and of the anointing oil, and sprinkle it upon Aaron, and upon his garments, and upon his sons, and upon the garments of his sons with him: and he shall be hallowed, and his garments, and his sons, and his sons’ garments with him.  The blood and oil from the altar were to be sprinkled on Aaron and his sons to hallow, or consecrate, them before God.