Reference for Yevamot 44:14

ורבי יוסי בר' יהודה אם כן לכתוב רחמנא אחותך היא למה לי משום אחותך אתה מחייבו ואי אתה מחייבו משום בת אשת אביו

— As R. Phinehas in the name of R. Papa said [elsewhere] 'When he repented', so here also it is a case where he repented. Is such a persona however, capable of penitence? Surely we learnt: Simeon b. Menasya said, That which is crooked cannot be made straight.<span class="x" onmousemove="('comment',' Eccl. I, 15. ');">¹³</span>

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