Exodus 34:29 - Clarke's commentary and critical notes on the Bible

And it came to pass, when Moses came down from mount Sinai with the two tables of testimony in Moses' hand, when he came down from the mount, that Moses wist not that the skin of his face shone while he talked with him. The skin of his face shone - קרן karan, was horned: having been long in familiar intercourse with his Maker, his flesh, as well as his soul, was penetrated with the effulgence of the Divine glory, and his looks expressed the light and life which dwelt within. Probably Moses appeared now as he did when, in our Lord's transfiguration, he was seen with Elijah on the mount, Matthew 17. As the original word קרן karan signifies to shine out, to dart forth, as horns on the head of an animal, or rays of light reflected from a polished surface, we may suppose that the heavenly glory which filled the soul of this holy man darted out from his face in coruscations, in that manner in which light is generally represented. The Vulgate renders the passage, et ignorabat quod cornuta esset facies sua, "and he did not know that his face was horned;" which version, misunderstood, has induced painters in general to represent Moses with two very large horns, one proceeding from each temple. But we might naturally ask, while they were indulging themselves in such fancies, why only two horns? for it is very likely that there were hundreds of these radiations, proceeding at once from the face of Moses. It was no doubt from this very circumstance that almost all the nations of the world who have heard of this transaction, have agreed in representing those men to whom they attributed extraordinary sanctity, and whom they supposed to have had familiar intercourse with the Deity, with a lucid nimbus or glory round their heads. This has prevailed both in the east and in the west; not only the Greek and Roman saints, or eminent persons, are thus represented, but those also among the Mohammedans, Hindoos, and Chinese.