Exodus 32:26 Then Moses stood in the gate of the camp, and said, Who is on the Lord's side? let him come unto me. And all the sons of Levi gathered themselves together unto him.
[Patriarchs & Prophets pp 350] By divine direction the tribe of Levi was set apart for the service of the sanctuary. In the earliest times every man was the priest of his own household. In the days of Abraham the priesthood was regarded as the birthright of the eldest son. Now, instead of the first-born of all Israel, the Lord accepted the tribe of Levi for the work of the sanctuary. By this signal honor He manifested His approval of their fidelity, both in adhering to His service and in executing His judgments when Israel apostatized in the worship of the golden calf.
The priesthood, however, was restricted to the family of Aaron. Aaron and his sons alone were permitted to minister before the Lord. The rest of the tribe were entrusted with the charge of the tabernacle and its furniture, and they were to attend upon the priests in their ministration, but they were not to sacrifice, to burn incense, or to see the holy things till they were covered. In accordance with their office, a special dress was appointed for the priests. “Thou shalt make holy garments for Aaron thy brother, for glory and for beauty,” was the divine direction to Moses.
The robe of the common priest was of white linen, and woven in one piece. It extended nearly to the feet and was confined about the waist by a white linen girdle embroidered in blue, purple, and red. A linen turban, or miter, completed his outer costume. Moses at the burning bush was directed to put off his sandals, for the ground whereon he stood was holy. So the priests were not to enter the sanctuary with shoes upon their feet. Particles of dust cleaving to them would desecrate the holy place.
Exodus 30:19 For Aaron and his sons shall wash their hands and their feet thereat: 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!