Everything the book of Genesis itself says about Nimrod fits in four verses. He is named in the Table of Nations, a son of Cush and so a grandson of Ham, and called the first to become a mighty man on earth, a mighty hunter before the LORD, a phrase repeated a second time for emphasis, so that "like Nimrod" became a fixed comparison in the text's own telling. His kingdom is said to begin at Babel, Erech, Akkad and Calneh in the land of Shinar and to extend into Assyria, where he builds Nineveh, Rehoboth Ir, Calah and Resen. Translators and commentators have long debated the phrase rendered "before the LORD": it can carry an admiring sense, a hunter of exceptional, even divinely favored skill, or a more ambiguous or hostile one, a man who set himself against the LORD rather than merely before him, and the Hebrew leaves the question genuinely open rather than resolved.
Historical critical scholarship has long puzzled over whether Nimrod preserves a folk memory of an actual Mesopotamian ruler or dynasty, with proposed identifications ranging across figures such as Sargon of Akkad, Tukulti-Ninurta I of Assyria and the god Ninurta himself, none of which has become a scholarly consensus. What the Genesis text itself offers is a spare genealogical notice, a founder of cities rather than a developed character, and it is entirely silent on the tower, the furnace and the confrontation with Abraham that later tradition would build onto this foundation.