Then Moses went up into the mountain, and a cloud covered the mountain.
Exodus 24:15
Surrounding context
24:14 And he said to the elders, "Wait here for us until we come back to you. Indeed, Aaron and Hur are with you. If any man has a difficulty, let him go to them."
24:15 Then Moses went up into the mountain, and a cloud covered the mountain.
24:16 Now the glory of the LORD rested on Mount Sinai, and the cloud covered it six days. And on the seventh day He called to Moses out of the midst of the cloud.