Kidneys of wheat. — The metaphor is literally translated from the Hebrew. The kidneys are enclosed in the very best of the fat of the animal, fat that was strictly reserved for God’s altar by the Levitical Law.
Related Commentaries of Deuteronomy 32:14
Deuteronomy 32:14
14 Butter of kine, and milk of sheep, with fat of lambs, and rams of the breed of Bashan, and goats, with the fat of kidneys of wheat; and thou didst drink the pure blood of the grape.