18 December O Adonai, et Dux domus Israel, qui Moysi in igne flammae rubi apparuisti, et ei in Sina legem dedisti: veni ad redimendum...
20 December O Clavis David, et sceptrum domus Israel; qui aperis, et nemo claudit; claudis, et nemo aperit: veni, et educ vinctum de domo...
The O Antiphons contain images from the Old Testament that give us insight into the new life that we welcome at Christmas, Our Lord...