Reference for Yevamot 131:1
אחוותא
twin sisters.<span class="x" onmousemove="('comment',' The two pairs of twins were children of R. Hiyya from Judith. ');"><sup>1</sup></span> But does not the commandment apply to women? Surely, R. Aha b. R. Kattina related in the name of R. Isaac: It once happened in the case of a woman who was half slave and half free, that her master was compelled to emancipate her!<span class="x" onmousemove="('comment',' So that she might be permitted to marry a free man, As a half slave she was not allowed to contract such a marriage. Now, since her master was compelled to give her the opportunity of marrying, it is obvious that the commandment of propagation applies to women also! ');"><sup>2</sup></span> R. Nahman b. Isaac replied: People were taking liberties with her.<span class="x" onmousemove="('comment',' And marriage was her only protection; and this was the reason why her master was compelled to emancipate her. ');"><sup>3</sup></span>