O Radix Iesse

O radix Iesse qui stas in signum populórum, super quem continébunt reges os suum, quem Gentes deprecabúntur: veni ad liberándum nos, iam noli tardáre.

O Root of Jesse, which standest for an ensign of the people, at whom the kings shall shut their mouths, to whom the Gentiles shall seek; come to deliver us, make no tarrying! 

The 'O Radix Iesse'  stanza from 'O Come, O Come Emanuel':

Veni o Jesse virgula!
Ex hostis tuos ungula,
De specu tuos tartari
Educ, et antro barathri.

Gaude, gaude, Emmanuel
nascetur pro te, Israel. 

O come, Thou Rod of Jesse, free
Thine own from Satan's tyranny;
From depths of hell Thy people save,
And give them victory o'er the grave.

Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel.

The following is from the New Liturgical Movement

The medieval use of Augsburg in Germany contains a particularly interesting enrichment of the liturgy on these days. Each O is accompanied by a special chapter, and a special concluding oration, both of which refer back to it; these form a kind of scriptural and euchological commentary on the much older antiphons. Like many medieval uses, that of Augsburg also added other antiphons to the series, which I will note in another post next week; here are the chapters and prayers which go with the seven oldest antiphons, those found in the Roman Breviary. At Augsburg, the Os began on December 13th, and so I have noted them here.

December 15 (19 in the Roman Breviary)

Capitulum Ecce radix Jesse ascendet in salutem populorum: ipsum gentes deprecabuntur: et erit nomen ejus gloriosum.	The Chapter Behold the root of Jesse shall arise for the salvation of the peoples; him the Gentiles shall beseech, and his name shall be glorious. (Isaiah 11, 10)
Aña O Radix Jesse, * qui stas in signum populorum, super quem continebunt reges os suum, quem gentes depreca- buntur: veni ad liberandum nos, jam noli tardare.	Aña O root of Jesse, * that standest as an ensign of the peoples, at whom the kings shall shut their mouths, whom the Gentiles shall beseech: come thou to deliver us, delay thou not.
Oratio Festina, ne tardaveris, Domine, Deus noster: et a diabolico furore nos potenter liberare dignare: Qui cum.	The Prayer Hasten, delay Thou not, o Lord, our God; and deign Thou mightily to deliver us from the wrath of the devil. Who with the Father...