Exodus 3:5

Then Jacob awoke from his sleep and said, “Surely Yahweh is in this place, and I did not know it.”

And the angel of Yahweh appeared to him in a blazing fire from the midst of the bush; and he looked, and behold, the bush was burning with fire, yet the bush was not consumed.

Then Yahweh spoke to Moses, “Go down, warn the people, lest they break through to Yahweh to see, and many of them perish.

“Since Yahweh your God walks in the midst of your camp to deliver you and to give your enemies over to you, therefore your camp must be holy; and He must not see anything indecent among you, or He will turn away from you.

The commander of the host of Yahweh said to Joshua, “Remove your sandals from your feet, for the place where you are standing is holy.” And Joshua did so.

Guard your steps as you go to the house of God and draw near to listen rather than to offer the sacrifice of fools; for they do not know they are doing evil.

‘And their mighty one shall be one of them, And their ruler shall come forth from their midst; And I will bring Him near, and He shall approach Me; For who would dare to give his heart as security to approach Me?’ declares Yahweh.

“But the Lord said to him, ‘Remove the sandals from your feet, for the place on which you are standing is holy ground.

and we ourselves heard this utterance made from heaven when we were with Him on the holy mountain.