Matthew Poole and continuators on 2 Samuel 8:17

17 And Zadok the son of Ahitub , and Ahimelech the son of Abiathar , were the priests ; and Seraiah was the Scribe;

Not of that Ahitub, 1 Sam. 4. for that was of Ithamar's race, but this of Eleazar.

So Abiathar called his Son by the name of his Father, 1 Sam. 22. 20.

i. e. The Chief Priest next under Abiathar, who fled to David, 1 Sam. 22. 20. and now was High Priest, as may be gathered from 2 Sam. 15. 35. and 1 King. 2. 27, 35. under him these two were the next Chief Priests, or the Second Priests, each one being Chief of the House of his Father, Zadok of Eleazar, and Ahimelech of Ithamar. See Numb. 3. 32. 1 Chron. 24. 3, 4. Or, these two are here mentioned, because they constantly attended upon the King, that he might consult with them in the matters of the Lord, as need required.

Marginal references: 1 Chron. 24. 3, 4.; Or, Secretary.