Exodus 34:3

“And no man shall come up with thee, etc.] Before, Aaron and his two sons, and the seventy elders of Israel, went up with Moses, though they did not go so near the Lord as he did; but now having sinned in the matter of the golden calf, though a reconciliation was made, they were not allowed to go with him, nor even Joshua his servant, though he had no concern in the sin; Moses must be alone, that the ministration of the law might be by him only, and in order to receive a peculiar favour in answer to his request: neither let any man be seen throughout all the mount; in any part of it, as Joshua was before in some part of it, even all the while that Moses was there; but now not a single person…”

“no man shall come up with thee . . . neither . . . flocks nor herds--All these enactments were made in order that the law might be a second time renewed with the solemnity and sanctity that marked its first delivery. The whole transaction was ordered so as to impress the people with an awful sense of the holiness of God; and that it was a matter of no trifling moment to have subjected Him, so to speak, to the necessity of re-delivering the law of the ten commandments.”

“Exo 19:12, Exo 19:13, Exo 19:21; Lev 16:17; Ti1 2:5; Heb 12:20 Exodus 34:5”