Exodus 19:24

“Also let the priests who come near to Yahweh set themselves apart as holy, lest Yahweh break out against them.”

Then He said to Moses, “Come up to Yahweh, you and Aaron, Nadab and Abihu and seventy of the elders of Israel, and you all shall worship at a distance.

I was standing between Yahweh and you at that time, to declare to you the word of Yahweh; for you were afraid because of the fire and did not go up the mountain. He said,

For you have not come to a mountain that can be touched and to a blazing fire, and to darkness and gloom and whirlwind,