"Moses" is a sculpture by Italian Renaissance artist Michelangelo Buonarroti

"Michelangelo's depiction of a horned Moses stems from the description of Moses' face as "cornuta" ("horned") in the Latin Vulgate translation of the passage found at Exodus chapter 34, specifically verses 29, 30 and 35, in which Moses returns to the people after receiving the commandments for the second time. The Douay-Rheims Bible translates the Vulgate as, 

"And when Moses came down from the Mount Sinai, he held the two tablets of the testimony, and he knew not that his face was horned from the conversation of the Lord." 

This was Jerome's effort to faithfully translate the difficult, original Hebrew text, which uses the term קָרַ֛ן, qāran (based on the root,  קָ֫רֶן qeren, which often means "horn"); the term is now interpreted to mean "shining" or "emitting rays"...