Exodus 24:16, "the cloud covered it six days. The seventh day he called to Moses out of the middle of the cloud" - the same six-day wait before a voice speaks from a cloud on a mountain.
After six days, Jesus took with him Peter, James, and John his brother, and brought them up into a high mountain by themselves.
Yahweh’s glory settled on Mount Sinai, and the cloud covered it six days. The seventh day he called to Moses out of the middle of the cloud.
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