Ibn Ezra on Isaiah
The oxen and young asses that ear the ground, that are employed in ploughing the fields. אלפים Oxen. Comp. אלפיך thine oxen (Deut. 7:13).
Rashi on Isaiah
enriched provender (בְּלִיל חָמִיץ) comp. (Job 6:5) “On his provender (בְּלִילוֹ).” Stubble and straw, strengthened and enriched with the grain within them, they shall eat.