Albert Barnes Commentary Jeremiah 20:1

"Now Pashhur, the son of Immer the priest, who was chief officer in the house of Jehovah, heard Jeremiah prophesying these things." — Jeremiah 20:1 (ASV)

Pashur, probably the father of the Gedaliah mentioned in (Jeremiah 38:1), was the head of the 16th course (shift) of priests; the other Pashur (Jeremiah 21:1) belonged to the fifth course, the sons of Melchiah. Both these houses returned in great strength from the exile. See (Ezra 2:37–38).

Chief governor - Or, “deputy governor.” The Nagid or governor of the temple was the high priest (1 Chronicles 9:11), and Pashur was his Pakid, i.e., deputy (see Jeremiah 1:10 note). Zephaniah held this office (Jeremiah 29:26), and his relation to the high priest is exactly defined (2 Kings 25:18; Jeremiah 52:24). The Nagid at this time was Seraiah the high priest, the grandson of Hilkiah, or (possibly) Azariah, Hilkiah’s son and Jeremiah’s brother (1 Chronicles 6:13; Ezra 7:1).