Exodus 16:5

16:5 On the sixth day they will prepare what they bring in, and it will be twice as much as they gather every other day.”

Exodus 19:11

19:11 and be ready for the third day, for on the third day the Lord will come down on Mount Sinai in the sight of all the people.

Exodus 34:2

34:2 Be prepared in the morning, and go up in the morning to Mount Sinai, and station yourself for me there on the top of the mountain.