21 and the LORD said to him, “Go down and warn the people not to break through to see the LORD, lest many of them perish.
Exodus 19:21 Cross References - MSB
Exodus 3:3
3 So Moses thought, “I must go over and see this marvelous sight. Why is the bush not burning up?”
Exodus 3:5
5 “Do not come any closer,” God said. “Take off your sandals, for the place where you are standing is holy ground.”
Exodus 19:12-13
12 And you are to set up a boundary for the people around the mountain and tell them, ‘Be careful not to go up on the mountain or touch its base. Whoever touches the mountain shall surely be put to death.
13 No hand shall touch him, but he shall surely be stoned or shot with arrows—whether man or beast, he must not live.’ Only when the ram’s horn sounds a long blast may they approach the mountain.”
Exodus 33:20
20 But He added, “You cannot see My face, for no one can see Me and live.”
1 Samuel 6:19
19 But God struck down some of the people of Beth-shemesh because they looked inside the ark of the LORD. He struck down seventy men, and the people mourned because the LORD had struck them with a great slaughter.
Ecclesiastes 5:1
1 Guard your steps when you go to the house of God. Draw near to listen rather than to offer the sacrifice of fools, who do not know that they do wrong.