Surah 2. Al-Baqara, Ayah 63

Lit., "and We raised the mountain (at-tur) above you": i.e., letting the lofty mountain bear witness, as it were, to their solemn pledge, spelled out in verse {83} below. Throughout my translation of the Qur'an, I am rendering the expression at-tur as "Mount Sinai", since it is invariably used in this sense alone.

The Mountain of Sinai (Tur-u-Sinin) a prominent mountain in the Arabian desert, in the peninsula between the two arms of the Red Sea. Here the Ten Commandments and the Law were given to Moses. Hence it is now called the Mountain of Moses (Jabal Musa). The Israelites encamped at the foot of it for nearly a year. The Covenant was taken from them under many portents (Exod. xix. 5,8,16,18), which are described in Jewish tradition in great detail. Under thunder and lightening the mountain must indeed have appeared an awe-inspiring sight above to the Camp at its foot. And the people solemnly entered into the Covenant: all the people answered together and said, "All that the Lord hath spoken we will do."