A mountain of God is the mountain of Bashan:

An high-peaked mountain is the mountain of Bashan.

Mount Hermon is probably meant, rather than the mountains of Bashan generally. It is the grandest of the mountains of Palestine, and was the northern boundary of Bashan (Deuteronomy 3:8). It has three summits of nearly equal height. Its natural preeminence seemed to mark it as a mountain of God, a mountain worthy to be the abode of God; and the early conquest of Bashan seemed to confirm its prior claim.

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