Reference for Bekhorot 84:33

וחולץ וחולצין לאשתו ומיבמים לאשתו

He submits to halizah,<span class="x" onmousemove="('comment',' V. Glos. As a restrictive measure, that where there is no other brother his sister-in-law must be released by him before she can be married.');">²²</span>

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