For the sake of everybody else, here are some relevant canons.
Canon 102 of Trullo: It behooves those who have received from God the power to loose and bind, to consider the quality of the sin and the readiness of the sinner for conversion, and to apply medicine suitable for the disease, lest if he is injudicious in each of these respects he should fail in regard to the healing of the sick man. For the disease of sin is not simple, but various and multiform, and it germinates many mischievous offshoots, from which much evil is diffused, and it proceeds further until it is checked by the power of the physician. Wherefore he who professes the science of spiritual medicine ought first of all to consider the disposition of him who has sinned, and to see whether he tends to health or (on the contrary) provokes to himself disease by his own behaviour, and to look how he can care for his manner of life during the interval. And if he does not resist the physician, and if the ulcer of the soul is increased by the application of the imposed medicaments, then let him mete out mercy to him according as he is worthy of it. For the whole account is between God and him to whom the pastoral rule has been delivered, to lead back the wandering sheep and to cure that which is wounded by the serpent; and that he may neither cast them down into the precipices of despair, nor loosen the bridle towards dissolution or contempt of life; but in some way or other, either by means of sternness and astringency, or by greater softness and mild medicines, to resist this sickness and exert himself for the healing of the ulcer, now examining the fruits of his repentance and wisely managing the man who is called to higher illumination. For we ought to know two things, to wit, the things which belong to strictness and those which belong to custom, and to follow the traditional form in the case of those who are not fitted for the highest things, as holy Basil teaches us.
Canon 4 of St. Basil In the case of trigamy and polygamy they laid down the same rule, in proportion, as in the case of digamy; namely one year for digamy (some authorities say two years); for trigamy men are separated for three and often for four years; but this is no longer described as marriage at all, but as polygamy; nay rather as limited fornication. It is for this reason that the Lord said to the woman of Samaria, who had five husbands, “he whom thou now hast is not your husband.” He does not reckon those who had exceeded the limits of a second marriage as worthy of the title of husband or wife. In cases of trigamy we have accepted a seclusion of five years, not by the canons, but following the precept of our predecessors. Such offenders ought not to be altogether prohibited from the privileges of the Church; they should be considered deserving of hearing after two or three years, and afterwards of being permitted to stand in their place; but they must be kept from the communion of the good gift, and only restored to the place of communion after showing some fruit of repentance.
Canon 50 of St. Basil: There is no law as to trigamy: a third marriage is not contracted by law. We look upon such things as the defilements of the Church. But we do not subject them to public condemnation, as being better than unrestrained fornication.
Canon 54 of St. Basil I know that I have already written to your reverence, so far as I can, on the distinctions to be observed in cases of involuntary homicide, and on this point I can say no more. It rests with your intelligence to increase or lessen the severity of the punishment as each individual case may require.
Canon 74 of St. Basil If, however, each man who has committed the former sins is made good, through penitence, he to whom is committed by the loving-kindness of God the power of loosing and binding will not be deserving of condemnation, if he become less severe, as he beholds the exceeding greatness of the penitence of the sinner, so as to lessen the period of punishment, for the history in the Scriptures informs us that all who exercise penitence with greater zeal quickly receive the loving-kindness of God.
Here are the canons of Trullo in full:
newadvent.org/fathers/3814.htm
And here are the three Canonical Epistles of St. Basil:
newadvent.org/fathers/3202188.htm
newadvent.org/fathers/3202199.htm
newadvent.org/fathers/3202217.htm
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