Prayers for the Departed

Rest, O Lord, the souls of Your servants (names), forgive all their sins, both voluntary and involuntary, grant them Your Heavenly Kingdom and make an everlasting memory for them. (This short prayer should be read as often as possible.)
Remember, O Lord our God, in faith and hope of eternal life the departed servants of Yours (names), and as the Good and Man‑loving One who forgives sins and destroys falsehood, grant them relief, release and forgiveness of all their sins, both voluntary and involuntary; deliver them from eternal torment and the fire of Gehenna, and grant them participation and the enjoyment of Your eternal blessings which You have prepared for those who love You. For although they have sinned, they have not turned away from You, but undoubtedly believed in the Father, the Son, and the Holy Spirit, in the glorified Trinity of God, and confessed the Trinity in unity orthodoxy to the last breath of their lives. Therefore be merciful to them, accept faith in You instead of deeds, and with Your saints, as the Generous, grant them rest, for there is no one who lives and does not sin. For You alone are without any sin, and Your truth is eternal truth; and You alone are the God of mercy, generosity, and love of mankind, and to You we lift up glory, Father, and Son, and Holy Spirit, now, ever, and unto ages of ages. Amen.
Source: kyrios.org.ua