Reference for Yevamot 51:22

אי הכי תלתא נמי

WAS FORBIDDEN BY VIRTUE OF A COMMANDMENT<span class="x" onmousemove="('comment',' The term is used in the Mishnah supra 20a and discussed in the Gemara loc. cit. ');">⁵¹</span> OR BY VIRTUE OF HOLINESS<span class="x" onmousemove="('comment',' The term is used in the Mishnah supra 20a and discussed in the Gemara loc. cit. ');">⁵¹</span> SHE MUST PERFORM THE <i>HALIZAH</i> BUT MAY NOT BE TAKEN IN LEVIRATE MARRIAGE.

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