Roodmas.

"Christ the holy Cross endur'd, burst the gates of hell in twain, and in might and majesty rose on easter morn again."*

-First antiphon,Lauds.

"as many as are of the works of the law, are under a curse. For it is written: Cursed is every one, that abideth not in all things, which are written in the book of the law to do them. But that in the law no man is justified with God, it is manifest: because the just man liveth by faith. But the law is not of faith: but, He that doth those things, shall live in them. Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written: Cursed is every one that hangeth on a tree: That the blessing of Abraham might come on the Gentiles through Christ Jesus: that we may receive the promise of the Spirit by faith."
Galatians 3:10-14.

"For let this mind be in you, which was also in Christ Jesus:Who being in the form of God, thought it not robbery to be equal with God: 7 But emptied himself, taking the form of a servant, being made in the likeness of men, and in habit found as a man. He humbled himself, becoming obedient unto death, even to the death of the cross. For which cause God also hath exalted him, and hath given him a name which is above all names: That in the name of Jesus every knee should bow, of those that are in heaven, on earth, and under the earth: And that every tongue should confess that the Lord Jesus Christ is in the glory of God the Father. "
Philippians 2:5-11

V.O Glorious Cross! *On thee did triumph the King of the Angels!
R. And our sins did washed in his blood.
Collect of the day:
O God,who didst will thine only-begotten Son to to endure the Cross for the salvation of the human race:Grant we beseech thee, that as we have acknowledged its mystery on earth, we may receive its redemption thereof in heaven.

*It's interesting that this antiphon actually rhymes in the Latin edition: "Crucem sanctam súbiit, qui inférnum confrégit; accínctus est poténtia, surréxit die tértia"
Very few of these medeival rhyming texts survived into the new breviary.