Reference for Yevamot 238:6

אביי בר אבין ורבי חנינא בר אבין אמרי תרוייהו גזירה שמא יהא ולד בן קיימא ונמצא אתה מצריכה כרוז לכהונה

perform <i>halizah</i>. R. Hanina said: On account of herself [she must wait] three months, but on account of her associate<span class="x" onmousemove="('comment',' Her rival who might he pregnant. ');">¹⁴</span> for ever.<span class="x" onmousemove="('comment',' Until it is definitely ascertained whether her rival had given birth to a viable child. ');">¹⁵</span> But let her perform <i>halizah</i><span class="x" onmousemove="('comment',' After a period of nine months (v. supra p. 843, n. 15), and so procure her freedom to marry again. ');">¹⁶</span>

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