Ezekiel 40:46
And the chamber whose prospect is toward the north is for the priests, the keepers of the charge of the altar: these are the sons of Zadok among the sons of Levi, which come near to the Lord to minister unto him.
Cross-reference
In Ezekiel 40:45, the south chambers are for temple priests — immediately paired with the altar priests here, forming two groups.
Ezekiel 43:19 again mentions the sons of Zadok, the priests who draw near — the same group from 40:46.
Ezekiel 44:15 identifies the sons of Zadok as those who kept charge during Israel's straying — the same group mentioned in 40:46.
Ezekiel 48:11 reaffirms the sons of Zadok as those who kept charge — directly echoing 40:46.
In Ezekiel 42:13, priests who approach the LORD eat holy offerings — same group of priests having charge of the altar.
In Ezekiel 44:8, priests failed to keep charge of God's sanctuary — contrasting with the faithful charge given to Zadokites here.
In Numbers 16:40, only priests may draw near to the altar — here the sons of Zadok are that authorized priestly line.
Numbers 18:5 commands keeping charge of the sanctuary and altar — expanding the duty of the priests who have charge of the altar in 40:46.
1 Kings 2:35 records Zadok being appointed priest — the historical foundation for the sons of Zadok in 40:46.