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And from the Byzantine Catholic Church in America website -from the Congregation for the Eastern Churches :ECCLESIA DE EUCHARISTIA --Bl. Pope John Paul Encyclical
“If a Christian’s conscience is burdened by serious sin, then the path of penance through the sacrament of Reconciliation becomes necessary for full participation in the Eucharistic Sacrifice.”
The Catechism of the Catholic Church notes:
1457 … Anyone who is aware of having committed a mortal sin must not receive Holy Communion, even if he experiences deep contrition, without having first received sacramental absolution, unless he has a grave reason for receiving Communion and there is no possibility of going to confession.57 …
57 Cf. Council of Trent (1551): DS 1647; 1661; CIC, can. 916; CCEO, can. 711.
The Catechism References there the Eastern Code of Canon Law 711 which goes into that one is not to receive the Divine Eucharist if one is conscious of serious sin (mortal sin) (outside the exceptional circumstance of a serious reason (grave reason) etc etc as noted above).
scborromeo.org/ccc/ccc_toc.htm
“In it, as affirmed by can. 718 of the Code of Canons of the Eastern Churches, the faithful who have committed sins after Baptism and resolve to lead a new life, “through the ministry of the priest, having themselves made a confession and accepted an appropriate penance, obtain forgiveness from God and at the same time are reconciled with the Church.” This confession, individual and integral, with absolution, constitutes the only ordinary means by which the Christian faithful aware of a serious sin can obtain omission.[74] Even if serious sins have not been committed, it is strongly recommended that all the Christian faithful frequently receive this sacrament, especially during times of fasts and penance.”
byzcath.org/