This is a variation on the melody of Tone 2 "Bulgarian" which I heard on the Vespers-Matins CD from Studites of the Univ Lavra.
lyrics
Come all you lovers** of virginity and chastity,* lovingly hold aloft the boast of virginity,* the fountain of life springing up from the solid stone.* She is the bush which grows in the barren land,* the bush of the non-material fire,** who cleanses and illumines our souls.