From the account given in the Apocalypse of Abraham
Azazel is a scavenger of sacrifices who pesters atoning sinners by eating their meat offerings. Worse is he has a tendency to badger sacrificers with snarky comments criticizing their disposal of good eats to gods that may not exist.
And the unclean bird spoke to me and said, "What are you doing, Abraham, on the holy heights, where no one eats or drinks, nor is there upon them food for men? But these all will be consumed by fire and ascend to the height, they will destroy you."