Prophets have often communicated with the Lord from the mountains. Ascending a mountain to commune with God symbolizes an attempt to leave the world behind and draw nearer to the Lord. The brother of Jared saw his vision of the pre-mortal Christ on mount Shelem (Ether 3:1), Nephi was commanded to go into a high mountain to receive instruction on how to build tools and a ship (1 Nephi 17:7-11), Moses communed with God on mount Horeb, i.e. Sinai (Ex 3:1-2), Ezekiel was shown his vision of the celestialized city of Jerusalem after he was caught away in the spirit into a very high mountain, (Ezek 40:1), Christ chose to pray on a mountain to get away from his followers (Matt 14:23), and finally the Transfiguration happened on a high mountain apart (Matt 17:1).
These high mountains were like temples for these prophets. The symbolism continues with the practice of building temples on hills or mountains, And it shall come to pass in the last days, that the mountain of the LORD's house shall be established in the top of the mountains, and shall be exalted above the hills; and all nations shall flow unto it. And many people shall go and say, Come ye, and let us go up to the mountain of the Lord (Isa 2:2).