Reference for Yevamot 233:5

אמר רב נחמן באת לבית דין ואמרה מת בעלי התירוני להנשא מתירין אותה להנשא ונותנין לה כתובתה תנו לי כתובתי אף להנשא אין מתירין אותה מאי טעמא אדעתא דכתובה אתאי

<b><i>MISHNAH</i></b>. ALL ARE REGARDED AS TRUSTWORTHY TO GIVE EVIDENCE<span class="x" onmousemove="('comment',' That her husband died. ');">¹⁵</span> FOR HER<span class="x" onmousemove="('comment',' Any woman. ');">¹⁶</span> EXCEPTING HER MOTHER-IN-LAW. THE DAUGHTER OF HER MOTHER-IN-LAW, HER RIVAL, HER SISTER-IN-LAW<span class="x" onmousemove="('comment',' The wife of her husband's brother, who becomes her rival if levirate marriage is contracted. ');">¹⁷</span> AND HER HUSBAND'S DAUGHTER.<span class="x" onmousemove="('comment',' All these are assumed to be, for one reason or another, hostile to her and are therefore suspected of giving false evidence (cf. supra n. 8) in the expectation that she will marry again and thereby become forever forbidden to their relative, her first husband. ');">¹⁸</span>

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