Правило 23 Василия Великого
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About those who marry two sisters, or marry two brothers, a message has been given from us, a list of which we have sent to your piety. But he who takes his brother's wife will not be accepted until he leaves her.
(Ap. 19; Trul. 26, 54; Neokes. 2; Basil the Great. 68, 76, 78, 87; Theophilus Alex. 5; Timothy Alex. 11).
To the question of whether a widower (or widower) can marry the sister of his deceased wife (the brother of his deceased husband), Saint Basil answers that he has already published a message about this (έπιστολίδιον), a message to Diodorus, Bishop of Taras, which is given as the 87th rule of Basil, where such a marriage is most decisively condemned. If someone accidentally entered into such a marriage, he can be allowed to repent only when such an illegal marriage ends. Regarding other things, see the interpretation of 87 rules of St. Basil.
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