Belil refers to animal fodder — a mixture of grains, straw, and other feed prepared for livestock. The word derives from balal (H1101), meaning "to mix" or "to mingle," reflecting the blended composition of the feed. It describes the seasoned provender given to working oxen and donkeys.
Isaiah's vision of eschatological abundance includes the detail that oxen and donkeys will eat belil — seasoned fodder winnowed with shovel and fork (Isaiah 30:24). This is not throwaway agricultural detail but a picture of total restoration: even the animals will feast. In a world under God's full blessing, nothing is neglected, nothing suffers want. Job also mentions belil when arguing that even animals have the sense not to cry out without cause (Job 6:5).