WHO ARE NOT ALLOWED TO PARTAKE THE FLESH AND BLOOD OF JESUS?
The Holy Communion after consecration is the body and the blood of Christ. The sanctified bread is the body (1 Cor 11:24) in the Spirit. The body of Christ is the church. This fact naturally disqualifies those who are not baptized from sharing the bread since they are not members of the body of Christ. Jesus also says that the cup is the New Covenant in His blood (1 Cor 11:25), which He has shed for the forgiveness of sins (Mt 26:28). For a non-baptized person, his sins are not forgiven, which makes it unacceptable for him to partake of the Holy Communion.
In addition, partaking of the Holy Communion imparts eternal life (Jn 6:54), which is only possible once we have been made alive with Christ. When a person undergoes a correctly-performed baptism, with the presence of the Spirit, he is raised from spiritual death (Rom 6:3–5; 8:11). In the light of Christ’s sacrificial work, it would thus be inconsistent to permit a person who is not baptized to partake of the Holy Communion, since he has not even chosen to be in Christ by accepting the one correct baptism.
Solemnity is the most appropriate tone for sacraments, especially one in which the great sacrifice of Christ is commemorated. Those who partake of the Holy Communion are asked to examine themselves—another indication that the Holy Communion cannot be partaken in a casual or flippant way. According to the teaching of Paul, anyone who partakes of the Holy Communion in an unworthy manner will be guilty of the body and blood of the Lord (1 Cor 11:27). Prior to partaking, forgiveness of sins is to be sought to ensure the wrath of God will not be poured upon us. The telling examples in Corinth serve as a stern warning—some became sick and even died because they took the Holy Communion lightly (1 Cor 11:30).
Based on Paul’s above teaching, it is biblically sound to forbid those who have committed mortal sins from taking the Holy Communion. A person who has committed a mortal sin has cut himself off from the life of Christ and from His body, the church. Would it be right for one who has chosen to turn his back on Christ to partake of the body and blood of Christ? Doing so would be tantamount to treating the body and blood of Christ as common (cf. Heb 10:29) and not giving due reverence to Christ’s sacrifice. This would be a profanity in the eyes of God.