Правило 79 Василия Великого
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One who goes berserk against his stepmother is subject to the same rule as one who goes berserk against his sister.
(Basily Vel. 67, 75).
Basil the Great equates a man who committed fornication with his stepmother to one who committed fornication with his sister, or to a murderer, and subjects him to twenty years of penance.
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