Canon 915

Canon 915, one of the canons of the current Code of Canon Law, forbids the administration of Holy Communion to those upon whom the penalty of excommunication or interdict has been imposed or declared or who obstinately persist in manifest grave sin:

Those who have been excommunicated or interdicted after the imposition or declaration of the penalty and others obstinately persevering in manifest grave sin are not to be admitted to holy communion.

The corresponding canon in the Code of Canons of the Eastern Churches, which binds members of the Eastern Catholic Churches, reads:

The publicly unworthy are to be kept from the reception of the Divine Eucharist