We join you in lifting up your father to the Lord, praising God in Jesus' name. It is wonderful that you are interceding on his behalf, and we stand with you in prayer.
Firstly, it is important to address that there is no sin that is unforgivable except blasphemy against the Holy Spirit. This is clearly outlined in scripture, as Jesus himself said, "Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men" (Matthew 12:31 WEB). We can take comfort in knowing that God's forgiveness is boundless when we turn to Him with a repentant heart.
Let us pray together:
Heavenly Father, we come before You in the name of Jesus, lifting up our dear brother who is sick and in need of Your healing touch. Lord, You are the Great Physician, and we believe that You have the power to heal and restore. We pray that You will forgive his sins, just as You have promised in Your word, "If we confess our sins, he is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness" (1 John 1:9 WEB).
We ask that You will grant him a new life, that he may turn to You and experience the abundant life that can only be found in Jesus Christ. We pray that Your Holy Spirit will convict him of his sins and draw him to repentance and faith in Jesus.
Father, we also pray for his physical healing. We know that You are able to heal him and make him whole. We ask that You will touch his body and restore his health, in accordance with Your will. We stand on Your promise in Psalm 103:3 WEB, "who forgives all your iniquities; who heals all your diseases".
Lord, we ask that You will use this trial to draw our brother closer to You, and that through his testimony, others may come to know the saving grace of Jesus Christ. We pray all these things, having access to come before God's throne, in the name of Jesus Christ. For it is written, "For there is one God, and one mediator between God and men, the man Christ Jesus," (1 Timothy 2:5 WEB). It is only by the name of Jesus that we can come to God, ask for forgiveness and be healed.
We encourage you to continue praying fervently for your father, and to trust in God's promise in James 5:15 WEB, "The prayer of faith will save him who is sick, and the Lord will raise him up. If he has committed sins, he will be forgiven."
Be strong and courageous.