Exodus 24:14

He said unto the elders. — Moses understood that his stay in the mount was about to be a prolonged one (see Exodus 24:12). He therefore prudently determined to make arrangements for the government and direction of the people during his absence. Aaron his brother, and Hur, the father of Bezaleel, perhaps his brother- in-law, seemed to him the fittest persons to exercise authority over the people during his absence; and accordingly he named them as the persons to whom application was to be made under any circumstances of difficulty.

Here. — In the plain below the mountain. The injunction was that the camp should not be moved until Moses came down, however long he might be detained by the Divine colloquy.