Miserere Mei Deus.
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The Latin text runs thus:
1. Miserere mei, Deus: secundum magnam misericordiam tuam.
2. Et secundum multitudinem miserationum tuarum, dele iniquitatem meam.
3. Amplius lava me ab iniquitate mea: et a peccato meo munda me.
4. Quoniam iniquitatem meam ego cognosco: et peccatum meum contra me est semper.
5. Tibi soli peccavi, et malum coram te feci: ut iustificeris in sermonibus tuis, et vincas cum iudicaris.
6. Ecce enim in inquitatibus conceptus sum: et in peccatis concepit me mater mea.
7. Ecce enim veritatem dilexisti: incerta et occulta sapientiae tuae manifestasti mihi.
8. Asperges me, Domine, hyssopo, et mundabor: lavabis me, et super nivem dealbabor.
9. Auditui meo dabis gaudium et laetitiam: et exsultabunt ossa humiliata.
10. Averte faciem tuam a peccatis meis: et omnes iniquitates meas dele.
11. Cor mundum crea in me, Deus: et spiritum rectum innova in visceribus meis.
12. Ne proiicias me a facie tua: et spiritum sanctum tuum ne auferas a me.
13. Redde mihi laetitiam salutaris tui: et spiritu principali confirma me.
14. Docebo iniquos vias tuas: et impii ad te convertentur.
15. Libera me de sanguinibus, Deus, Deus salutis meae: et exsultabit lingua mea iustitiam tuam.
16. Domine, labia mea aperies: et os meum annuntiabit laudem tuam.
17. Quoniam si voluisses sacrificium, dedissem utique: holocaustis non delectaberis.
18. Sacrificium Deo spiritus contribulatus: cor contritum, et humiliatum, Deus, non despicies.
19. Benigne fac, Domine, in bona voluntate tua Sion: ut aedificentur muri Ierusalem.
20. Tunc acceptabis sacrificium iustitiae, oblationes, et holocausta: tunc imponent super altare tuum vitulos.
An English translation:
1. Have mercy upon me, O God, after Thy great goodness:
2. According to the multitude of Thy mercies do away mine offences.
3. Wash me throughly from my wickedness: and cleanse me from my sin.
4. For I acknowledge my faults: and my sin is ever before me.
5. Against Thee only have I sinned, and done this evil in thy sight: that Thou mightest be justified in Thy saying, and clear when Thou art judged.
6. Behold, I was shapen in wickedness: and in sin hath my mother conceived me.
7. But lo, Thou requirest truth in the inward parts: and shalt make me to understand wisdom secretly.
8. Thou shalt purge me with hyssop, and I shall be clean: Thou shalt wash me, and I shall be whiter than snow.
9. Thou shalt make me hear of joy and gladness: that the bones which Thou hast broken may rejoice.
10. Turn Thy face from my sins: and put out all my misdeeds.
11. Make me a clean heart, O God: and renew a right spirit within me.
12. Cast me not away from Thy presence: and take not Thy Holy Spirit from me.
13. O give me the comfort of Thy help again: and stablish me with Thy free Spirit.
14. Then shall I teach Thy ways unto the wicked: and sinners shall be converted unto Thee.
15. Deliver me from blood-guiltiness, O God, Thou that art the God of my health: and my tongue shall sing of Thy righteousness.
16. Thou shalt open my lips, O Lord: and my mouth shall shew Thy praise.
17. For Thou desirest no sacrifice, else would I give it Thee: but Thou delightest not in burnt-offerings.
18. The sacrifice of God is a troubled spirit: a broken and contrite heart, O God, shalt Thou not despise.
19. O be favorable and gracious unto Sion: build Thou the walls of Jerusalem.
20. Then shalt Thou be pleased with the sacrifice of righteousness, with the burnt-offerings and oblations: then shall they offer young bullocks upon Thine altar.