Why a Calf?

(17) You shall make a cover of pure gold, two and a half cubits long and a cubit and a half wide. (18) Make two cherubim of gold—make them of hammered work—at the two ends of the cover. (19) Make one cherub at one end and the other cherub at the other end; of one piece with the cover shall you make the cherubim at its two ends.

(14) Each one had four faces: One was a cherub’s face, the second a human face, the third a lion’s face, and the fourth an eagle’s face.

(6) However, each had four faces, and each of them had four wings; (7) the legs of each were [fused into] a single rigid leg, and the feet of each were like a single calf’s hoof; and their sparkle was like the luster of burnished bronze. (8) They had human hands below their wings. The four of them had their faces and their wings on their four sides. (9) Each one’s wings touched those of the other. They did not turn when they moved; each could move in the direction of any of its faces. (10) Each of them had a human face [at the front]; each of the four had the face of a lion on the right; each of the four had the face of an ox on the left; and each of the four had the face of an eagle [at the back].

"This is my G d and I will extol Him": R. Eliezer says: Whence is it derived that a maid-servant saw at the Yam Suf what was not seen even by Ezekiel and the other prophets, of whom it is written (Hoshea 12:11) "And to the prophets I appeared (in various) guises," and (Ezekiel 1:1) "The heavens opened and I saw visions of G d"?