'Lily' in the Bible

My Strength, I will sing praises to you, for you, God of Gracious Love, are my fortress. To the Director: A special Davidic psalm to the tune of "Lily of The Covenant," for teaching about his battle with Aram-naharaim and Aram-zobah, when Joab returned and attacked 12,000 Edomites in the Salt Valley.

To the Overseer. -- 'Concerning the Lily of Testimony,' a secret treasure of David, to teach, in his striving with Aram-Naharaim, and with Aram-Zobah, and Joab turneth back and smiteth Edom in the valley of Salt -- twelve thousand. O God, Thou hadst cast us off, Thou hadst broken us -- hadst been angry! -- Thou dost turn back to us.