Leviticus 8:25
And he took the fat, and the rump, and all the fat that was upon the inwards, and the caul above the liver, and the two kidneys, and their fat, and the right shoulder: And he took the fat, and the rump, and all the fat that was upon the inwards, and the caul above the liver, and the two kidneys, and their fat, and the right shoulder:
Leviticus 8:25 lists the portions taken for the priests' consecration offering: the fat, and the rump, and all the fat upon the inwards, and the caul above the liver, and the two kidneys and their fat, and the right shoulder. The verse belongs to the seven-day ceremony in which Moses consecrated Aaron and his sons to the Levitical priesthood to minister in the earthly, typical sanctuary before the ark. That consecration was performed before they began ministering for others. It set Aaron apart for God's service. The blood sprinkled during the ceremony hallowed both Aaron and his priestly garments.
After the consecration, God publicly accepted Aaron's service as high priest by sending fire to consume the first offering he made for the people. That Levitical priestly service continued while the sanctuary system remained in operation. Its sacrifices could not take away sin. The details of the laws of sacrifice each had meaning, and their fuller meaning is found in the sacrifice, life, and work of Jesus Christ. The sacrifices in the first eight chapters of Leviticus each contain a type of the work of Jesus Christ. The slain animals pointed penitent sinners forward to Christ, the great Sacrifice, the Lamb of God who takes away the sin of the world.
The ceremonies were a type of consecration to God. Consecrating all to God brings the Holy Spirit's anointing. That anointing fits people for service for others. It makes them a dwelling place for God.