Albert Barnes Commentary 2 Chronicles 31:14

"And Kore the son of Imnah the Levite, the porter at the east [gate], was over the freewill-offerings of God, to distribute the oblations of Jehovah, and the most holy things." — 2 Chronicles 31:14 (ASV)

The porter toward the east - that is, the chief doorkeeper at the east gate, where the proper number of the porters was six (1 Chronicles 26:17).

The most holy things - The sin offerings and trespass offerings (Leviticus 6:25; Leviticus 7:1–6).