The prayer, Kýrie, eléison, "Lord, have mercy" derives from a Biblical phrase. Greek ἐλέησόν με κύριε, 'have mercy on me, Lord', is the Septuagint translation of the phrase חָנֵּנִי יְהוָה often found in the Psalms (6:2, 9:13, 31:9, 86:3, and 123:3).
Kýrie, eléison (Κύριε, ἐλέησον)
'Lord, have mercy'
Christe, eléison (Χριστέ, ἐλέησον)
'Christ, have mercy'