Who had Jeremiah beaten and put in the stocks at the Upper Gate of Benjamin?

Answer: Pashhur son of Immer

Pashhur the priest, son of Immer and chief official in the house of the LORD, had Jeremiah beaten and put in the stocks.

“When Pashhur the priest, the son of Immer and the chief official in the house of the LORD, heard Jeremiah prophesying these things, he had Jeremiah the prophet beaten and put in the stocks at the Upper Gate of Benjamin, which was by the house of the LORD.”— Jeremiah 20:1-2 (BSB)