Reference for Yevamot 238:7

וליצרכה דלמא איכא דהוי בחליצה ולא הוי בהכרזה ואמרי קשרו חלוצה לכהן

at all events!<span class="x" onmousemove="('comment',' Since either she is exempted altogether from the levirate obligations by the birth of her rival's child (if one was horn) or (if no viable child was born) she gains her freedom by the halizah. ');">¹⁷</span> — Both Abaye b. Abin and R. Hanina b. Abin replied: This<span class="x" onmousemove="('comment',' That no halizah must be performed; v. supra n. 3. ');">¹⁸</span> is a preventive measure against the possibility that the child<span class="x" onmousemove="('comment',' Of the rival. ');">¹⁹</span>

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