'Mountain of God' in the Bible

Now Moses was looking after the flock of Jethro, his father-in-law, the priest of Midian: and he took the flock to the back of the waste land and came to Horeb, the mountain of God.

And the Lord said to Aaron, Go into the waste land and you will see Moses. So he went and came across Moses at the mountain of God, and gave him a kiss.

And Jethro, Moses' father-in-law, came with his sons and his wife to where Moses had put up his tent in the waste land, by the mountain of God.

Then Moses and Joshua his servant got up; and Moses went up into the mountain of God.