Exodus 28:30 And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron's heart, when he goeth in before the Lord: and Aaron shall bear the judgment of the children of Israel upon his heart before the Lord continually.
[Patriarchs & Prophets pp 351>352] At the right and left of the breastplate were two large stones of great brilliancy. These were known as the Urim and Thummim. By them the will of God was made known through the high priest. When questions were brought for decision before the Lord, a halo of light encircling the precious stone at the right was a token of the divine consent or approval, while a cloud shadowing the stone at the left was an evidence of denial or disapprobation. The miter of the high priest consisted of the white linen turban, having attached to it by a lace of blue, a gold plate bearing the inscription, “Holiness to Jehovah.”
Everything connected with the apparel and deportment of the priests was to be such as to impress the beholder with a sense of the holiness of God, the sacredness of His worship, and the purity required of those who came into His presence. Not only the sanctuary itself, but the ministration of the priests, was to “serve unto the example and shadow of heavenly things.” Hebrews 8:5. Thus it was of great importance; and the Lord, through Moses, gave the most definite and explicit instruction concerning every point of this typical service. The ministration of the sanctuary consisted of two divisions, a daily and a yearly service. The daily service was performed at the altar of burnt offering in the court of the tabernacle and in the holy place; while the yearly service was in the most holy.
No mortal eye but that of the high priest was to look upon the inner apartment of the sanctuary. Only once a year could the priest enter there, and that after the most careful and solemn preparation. With trembling he went in before God, and the people in reverent silence awaited his return, their hearts uplifted in earnest prayer for the divine blessing. Before the mercy seat the high priest made the atonement for Israel; and in the cloud of glory, God met with him. His stay here beyond the accustomed time filled them with fear, lest because of their sins or his own he had been slain by the glory of the Lord.
Exodus 30:20 When they go into the tabernacle of the congregation, they shall wash with water, that they die not; or when they come near to the altar to minister, to burn offering made by fire unto the Lord.
May The Lord add His blessing to the study of His word. God bless!