The earth is glad, O Lord, and leaps with joy, for that the Word made flesh dwells in the womb of the holy Virgin. At His coming the whole earth is ransomed from captivity, after having been kept, by Adam’s sin, in a dark prison. Now let the sea be moved, and all things that are therein; let the mountains leap with joy, and all the trees of the forest; because God, having become man, has deigned to come through the womb of the blessed Virgin Mary, from heaven into this world. By this His coming, therefore, we beseech Thee, O almighty God, that thou loose the weakness of our flesh from the bonds of sin, and come in Thy overflowing mercy, to the assistance of this Thy family here present before Thee.
From the Mozarabic Missal quoted by Michael Davies in an article “Et Incarnatus Est”