'Minister' in the Bible

They shall be on Aaron and his sons when they enter the Tent of Meeting or when they approach the altar to minister in the Holy Place so they don't incur guilt and die. This is to be a perpetual ordinance for him and for his descendants after him."

Aaron's son, who is priest in his place, is to wear them for seven days when he comes into the Tent of Meeting to minister in the Holy Place.

When they enter the Tent of Meeting or when they approach the altar to minister to make an offering by fire to the LORD, they are to wash with water so they don't die.