Exodus 34:2-4

2Make yourself ready in the morning and come up Sinai mountain. Stand there, ready to meet me on the top of the mountain.

3Nobody must come with you. Nobody must go anywhere on the mountain. Even your sheep and your cows must not eat grass near the bottom of the mountain.’

4So Moses cut two flat stones like the first stones. Early in the morning, he went up Sinai mountain, as the Lord had commanded him. He carried the two flat stones in his hands.