The Vigil of St. John the Baptist
Ne timeas, Zacharia, exaudita est oratio tua: et Elisabeth uxor tua pariet tibi filium, et vocabis nomen ejus Joannem: et erit magnus coram Domino: et Spiritu sancto replebitur adhuc ex utero matris suae: et multi in nativitate ejus gaudebunt. * Domine, in virtute tua laetabitur rex: et super salutare tuum exsultabit vehementer.
Fear not Zachary; thy prayer is heard, and thy wife Elizabeth shall bear thee a son, and thou shalt call his name John; and he shall be great before the Lord and he shall be filled with the Holy Ghost even from his mother's womb; and many shall rejoice at his birth. * In Thy strength, O Lord, the king shall joy: and in Thy salvation he shall rejoice exceedingly.
(St Luke 1:13,15,14 and Psalm 20:2 from the introit of Mass)
Praesta, quaesumus, omnipotens Deus, ut familia tua per viam salutis incedat; et beati Joannis praecursoris hortamenta sectando, ad eum quem praedixit, secura perveniat, Dominum nostrum Je-sum Christum Filium tuum.
Grant, we beseech Thee, O almighty God, that Thy servants may walk in the way of salvation; and by following the exhortations of blessed John the precursor, may safely attain unto Him whom he foretold, Thy Son, our Lord Jesus Christ.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/08486b.htm