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Genesis 22:2: "Then He said, “Take now your son, your only son Isaac, whom you love, and go to the land of Moriah, and offer him there as a burnt offering on one of the
mountains of which I shall tell you."
Mountains is from the Hebrew
har.
2 Chronicles 3:1: "Now Solomon began to build the house of the LORD at Jerusalem on
Mount Moriah where the LORD had appeared to his father David at the place that David had prepared on the threshing floor of Ornan the Jebusite."
Mount is from the Hebrew
har.
In scripture
har is translated as mountains and as mount.
Mount Moriah was not the only mountain in the land of Moriah.
There was more than one mountain in the land of Moriah.
"It was a wonderful location, on a mountain top 834 meters above sea level, with vast military and historical significance. Indeed, it was from Mount Scopus that Roman General Titus commanded the siege, conquest, and destruction of Jerusalem during the Great Revolt nearly 2,000 years ago."
(
http://www.timesofisrael.com/history-on-high-at-mount-scopus/)
Also there was Mount Zion, Mount Ophel, and Mount Moriah in the land of Moriah.
Which was the correct mountain for the Temple? Answer: The one with water in David's day.