'Priests' in the Bible

and you shall be to me a kingdom of priests, and a holy nation.' These are the words which you shall speak to the children of Israel."

Let the priests also, who come near to Yahweh, sanctify themselves, lest Yahweh break forth on them."

Yahweh said to him, "Go down and you shall bring Aaron up with you, but don't let the priests and the people break through to come up to Yahweh, lest he break forth on them."