Ezekiel 48:11

11The sanctuary shall be for the priests from the sons of Zadok, who observed my ceremonies and did not go astray, when the sons of Israel went astray, just as the Levites also went astray.
48:11The sons of Zadok are not literally the descendents of Zadok, but rather all those priests and Levites who remained faithful to the ordinances of the Lord when so many others went astray. The name Zadok means ‘righteous.’ A number of different persons are called Zadok in Scripture. These individual were perhaps given the name ‘Zadok’ by Scripture because their behavior was righteous; they were not necessarily given the name Zadok from childhood.(Conte)
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