Advent postings from MereComments:
Root of Jesse, which standest for an ensign of the people, at Whom the kings shall shut their mouths, Whom the Gentiles shall seek, come to deliver us, do not tarry.
Isaiah 11:1 In that day the root of Jesse shall stand as an ensign to the peoples; him shall the nations seek, and his dwellings will be glorious.
and 20 December:
And I will place upon his shoulder the key of the house of David; he shall open, and none shall shut; and he shall shut, and none shall open. Isaiah 22:22
The Advent Antiphon for December 20:
O Key of David, and Sceptre of the house of Israel, that openeth and no man shutteth, and shutteth and no man openeth, come to liberate the prisoner from the prison, and them that sit in darkness, and in the shadow of death.
With the added treat of having the audio link over at STR blog. This link will not last long so enjoy it while you can. Highly recomended. Also there at STR is an explantion of the O Antiphons