Mount Sinai

According to the Book of Exodus, Mount Sinai (Hebrew: הר סיני, Har Sinai) is the mountain at which the Ten Commandments were given to Moses by God. In the Book of Deuteronomy, these events are described as having transpired at Mount Horeb. “Sinai” and “Horeb” are generally considered to refer to the same place, although there is a small body of opinion that the two names may refer to different locations.
Hebrew Bible texts describe the theophany at Mount Sinai in terms which a minority of scholars, following Charles Beke (1873), have suggested may literally describe the mountain as a volcano and have led to a search for alternative locations.

Biblical description
According to the biblical account of the giving of the instructions and teachings of both the Written and the Oral Torah, Mount Sinai was enveloped in a cloud, it quaked and was filled with smoke, while lightning-flashes shot forth, and the roar of thunder mingled with the blasts of a trumpet; the account later adds that fire was seen burning at the summit of the mountain. In the biblical account, the fire and clouds are a direct consequence of the arrival of God upon the mountain. According to the biblical story, Moses departed to the mountain and stayed there for 40 days and nights in order to receive the Ten Commandments, the Written and the Oral Torah, and he did so twice because he broke the first set of the tablets of stone after returning from the mountain for the first time.
Source : wikipedia 
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