Albert Barnes Commentary Nehemiah 13:5

"had prepared for him a great chamber, where aforetime they laid the meal-offerings, the frankincense, and the vessels, and the tithes of the grain, the new wine, and the oil, which were given by commandment to the Levites, and the singers, and the porters; and the heave-offerings for the priests." — Nehemiah 13:5 (ASV)

The offerings of the priests – that is, “the portion of the offerings assigned for their sustenance to the priests.”