'Priestly' in the Bible

Now a man of the house of Levi [the priestly tribe] went and took as his wife a daughter of Levi.

then Moses stood in the gate of the camp, and said, “Whoever is on the Lord’s side, come to me!” And all the sons of Levi [the priestly tribe] gathered together to him.

So they came forward and carried them, still in their undertunics, outside the camp, as Moses had said.

If a priest’s daughter is married to a layman [one not part of the priestly tribe], she shall not eat the offering of the holy things.

So you shall appoint Aaron and his sons, and they shall observe and attend to their priesthood; but the layman (non-Levite) who approaches [the holy things] shall be put to death.”

After Moses stripped Aaron of his [priestly] garments and put them on Eleazar his son, Aaron died there on the mountain top. Then Moses and Eleazar came down from the mountain.

David was clothed with a robe of fine linen, as were all the Levites who carried the ark, and the singers and Chenaniah, director of the music of the singers. David also wore an ephod (a priestly upper garment) of linen.

When he had consulted with the people, he appointed those who sang to the Lord and those who praised Him in their holy (priestly) attire, as they went out before the army and said, “Praise and give thanks to the Lord, for His mercy and lovingkindness endure forever.”

So you will stumble in the daytime,And the [false] prophet will also stumble with you in the night;And I will destroy your mother (Israel).

My people are destroyed for lack of knowledge [of My law, where I reveal My will].Because you [the priestly nation] have rejected knowledge,I will also reject you from being My priest.Since you have forgotten the law of your God,I will also forget your children.

the [priestly] family of the house of Levi by itself and their wives by themselves; the family of Shimei [grandson of Levi] by itself and their wives by themselves;

Then you will know [without any doubt] that I have sent this [new] commandment to you (priests), that My covenant may continue with Levi [the priestly tribe],” says the Lord of hosts.