O Adonái et Dux domus Israel, qui Moysí in igne flammæ rubi apparuísti, et ei in Sina legem dedísti: veni ad rediméndum nos in brácchio exténto.
The Monastic Diurnal has:
O Adonai, and Leader of the house of Israel, Who didst appear to Moses in the flame of the burning bush and didst give him the law in Sinai: come, and with an outstretched arm, redeem us.
The Divine Office (used in the UK, Ireland and Australia) has:
O Adonai and leader of Israel, you appeared to Moses in a burning bush and you gave him the law on on Sinai. O come and save us with your mighty power.
At some point (13th century according to my hymn book) the O Antiphons were turned into a (Latin) hymn. J.M. Neale (1818-1866) translated it as "O Come, O Come Emmanuel"
O come, O come, thou Lord of might,
Who to thy tribes on Sinai's height,
In ancient times didst give the law
In cloud, and majesty, and awe.
This version of the same hymn, sung to the same tune, by T.A. Lacey (1853-1931) is less well known. It appears in older Anglican hymnals and is the version used by the Choir of King's College Cambridge for their recording of an Advent carol service.
O come, O come, Adonaï,
Who in thy glorious majesty
From that high mountain clothed with awe
Gavest thy folk the elder law.
Scripture:
And the angel of the LORD appeared to him in a flame of fire out of the midst of a bush; and he looked, and lo, the bush was burning, yet it was not consumed. - Exodus 3:2
For the LORD is our judge, the LORD is our ruler, the LORD is our king, he will save us. - Isaiah 33:22.
O give thanks to the Lord of lords...to him who smote the first-born of Egypt...and brought Israel out from among them...with a strong hand and an outstretched arm, for his steadfast love endures forever. - Psalm 135 (136):10-12.
Now when forty years had passed, an angel appeared to him in the wilderness of Mount Sinai, in a flame of fire in a bush. - Acts 7:30.
cf Exodus 20.
Video, audio (.rm) with notation, audio (mp3).
