Prayers against Defilement

Troparion, verse 4: Good Shepherd, Thou hast laid down Thy soul for us; Thou knowest the secret deeds which I have done; O One Good One, watch over me, who am lost in mind, and save me from the beast, Lamb of God, and have mercy on me.

Theotokion, verse 7: Theotokos, may through Thy intercession the Almighty and merciful God deliver us from the sins that surround us, for we, the faithful, have no other hope except the Lord who was born of Thee.

Prayer of St. Basil the Great

O merciful, uncreated, undefiled, sinless Lord, cleanse me, Thy wandering servant, from every bodily and spiritual impurity, and from the uncleanness which I have incurred through my negligence and despair, and from my other transgressions; and make me undefiled, O Master, for the sake of the goodness of Thy Christ, and sanctify me by the presence of Thy Most Holy Spirit, that I may be delivered from the darkness of unclean demonic apparitions, from every impurity, and may, with a pure conscience, open my defiled and unclean mouth to proclaim Thy all‑holy name, Father, Son, and Holy Spirit, now, always, and unto ages of ages. Amen.

Source: kyrios.org.ua