Matthew Poole and continuators on Jeremiah 20:1

1 NOW Pashur the son of Immer the priest , who was also chief governour in the house of the LORD , heard that Jeremiah prophesied these words .

The course of Immer was the sixteenth course of the Priests, as we read in 1 Chron. 24.14. Pashur was his Son, that is descended from him through many Generations.

It is neither much material for us to know, nor very easie to determine in what sense he is called the chief Governour of the Temple, whether he was Deputy to the High Priest, or the head of his course, which at that time waited in the Temple, or had some place as Captain of the Temple, to take notice of any disorders should be committed there, contrary to the Law. Certain it is he was no High Priest for then he could not have been one of the course of Immer.

Either he heard Ieremiah himself (which is most probable) or some body told him what Ieremiah had prophesied in the Temple which was within his charge, and jurisdiction.