Nicæa I: canon XIII

Concerning the departing, the ancient canon law is still to be maintained namely that those who are departing are not to be deprived of their last, most necessary viaticum. But if one whose life has been despaired of has been admitted to communion and has shared in the offering and is found to be numbered again among the living, he shall be among those who take part in prayer only [here a variant reading in Les canons des conciles oecumeniques adds "until the term fixed by this great ecumenical synod has been completed"]. But as a general rule, in the case of anyone whatsoever who is departing and seeks to share in the eucharist, the bishop upon examining the matter shall give him a share in the offering.