Exodus 24:2

24:2 Moses alone may come near the Lord, but the others must not come near, nor may the people go up with him.”

Exodus 19:24

19:24 The Lord said to him, “Go, get down, and come up, and Aaron with you, but do not let the priests and the people force their way through to come up to the Lord, lest he break through against them.”

Exodus 33:1

33:1 The Lord said to Moses, “Go up from here, you and the people whom you brought up out of the land of Egypt, to the land I promised on oath to Abraham, to Isaac, and to Jacob, saying, ‘I will give it to your descendants.’