Exodus 29-31…Sacrifices, ceremonies, burnt offerings, and the sabbath.
Aaron and his sons were to be set apart for the priest’s office, with ceremony and reverence. Our Lord Jesus is the great High Priest, called by God, anointed with the Spirit. He is called Messiah, the Christ. He is clothed with glory and beauty, perfectly holy, and consecrated through His sufferings (Hebrews 2:10). All believers are spiritual priests, called to offer spiritual sacrifices (1 Peter 2:5), washed in the blood of Christ. We also are clothed with the beauty of holiness, and have received the anointing (1 John 2:27). The Spirit of God is called the finger of God, (Luke 11:20; Matthew 12:28,) and by Him the holiness of Christ is applied to our souls. This signifies the admission of a sinner into the spiritual priesthood, to offer spiritual sacrifices, acceptable to God through Jesus Christ.
The law was written in tables of stone, to show how lasting it is. This also symbolizes the hardness of our hearts. It is easier to write something on a stone, than to write any thing good on our hardened natural hearts. Only God can write his law in our hearts, and give us desires in line with His. Only God could have perfectly obeyed His own law, and did so in Christ.