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 (knew) not that the skin of his face shone while He (God) talked with him. This wonderful brilliancy was caused by the vision of God on Mount Sinai. A reflection of the divine glory lingered in the face of Moses for some time after his return from the mountain.
Related Commentaries of Exodus 34:29
Exodus 34:29
29 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.