Exodus 19:21-25

21Then the Lord spoke to Moses, “Go down, warn the people, so that they do not break through [the barriers around the mountain] to the Lord to see [Me], and many of them perish [as a result].

22Also have the priests who approach the Lord consecrate (sanctify, set apart) themselves [for My sacred purpose], or else the Lord will break forth [in judgment] against them [and destroy them].”

23Moses said to the Lord, “The people cannot come up to Mount Sinai, because You warned us, saying, ‘Set barriers around the mountain and consecrate it.’ ”

24Then the Lord said to him, “Go down and come up again, you and Aaron with you; but do not let the priests and the people break through [the barriers] to come up to the Lord, or He will break forth [in judgment] against them [and destroy them].”

25So Moses went down to the people and told them [again about God’s warning].