'Mountain of God' in the Bible

And Moses was feeding the sheep of Jethro, his father-in-law, the priest of Midian: and he will lead the sheep behind the desert, and he will come to the mountain of God, to Horeb.

And Jethro, Moses' father-in-law, will come, and and his sons and his wife, to Moses to the desert, where he encamped there in the mountain of God.

And Moses will rise up, and Joshua, his minister; and Moses will go up to the mountain of God.