Prayer for every departed person
Remember, O Lord our God, Thy servant, our brother/sister, N., who has reposed in the Faith and hope of life eternal, and in that Thou art good and the Lover of mankind, Who remittest sins and blottest out iniquities, do Thou loose, remit and pardon all his/her sins, voluntary and involuntary.
Deliver him/her from eternal torment and the fire of Gehenna, and grant unto him/her the communion and delight of Thine eternal good things prepared for them that love Thee.
For though he/she hath sinned, yet hath he/she not forsaken Thee, and he/she undoubtedly believed in the Father and the Son and the Holy Spirit; and even until his/her last breath did he/she confess Thee in Orthodox fashion: God glorified in Trinity, Unity in Trinity and Trinity in Unity.
Wherefore, be Thou merciful unto him/her and reckon his/her faith in Thee, rather then his/her deeds, and in that Thou art compassionate, grant him/her rest with Thy saints; for there is no man that liveth and doth not sin.
But Thou alone art wholly without sin, and Thy truth is forever; and Thou alone art the God of mercies, and compassion, and love for mankind, and unto Thee do we ascribe glory, to the Father, and to the Son and to the Holy Spirit, now and ever, and unto ages of ages. Amen.
In the back of the "Boston" Psalter. http://www.synaxis.info/psalter/5_english/b_reading/kath_prayers.html