Reference for Bekhorot 84:48

מאי בינייהו

And who [of R'Akiba's pupils is the Tanna] who holds this opinion according to R'Akiba?<span class="x" onmousemove="('comment',' That she is released by halizah and must not marry her brother-in-law, for R. Akiba himself maintains that a born saris can neither release his sister-in-law by halizah nor marry her.');">³⁴</span>

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