O Adonai, et Dux domus Israel, qui Moysi in igne flammæ rubi apparuisti, et ei in Sina legem dedisti: veni ad redimendum nos in brachio extento.
O Adonai, and Ruler of the house of Israel, Who didst appear unto Moses in the burning bush, and gavest him the law in Sinai, come to redeem us with an outstretched arm!
But he shall judge the poor with justice, and shall reprove with equity the meek of the earth: and he shall strike the earth with the rod of his mouth, and with the breath of his lips he shall slay the wicked. And justice shall be the girdle of his loins: and faith the girdle of his reins.
For the Lord is our judge, the Lord is our lawgiver, the Lord is our king: he will save us.
Check out my publication which provides commentary on the O Antiphons, in addition to direction on how to pray the Mass during Advent. This publication is a perennial addition to your library. Go HERE for more information on Praying the Mass During Advent.