Reference for Bekhorot 118:1

אף התשיעי אינו קדוש אלא א"כ נעקר שם עשירי הימנו

The ninth also is not sacred<span class="x" onmousemove="('comment',' Referring to the Mishnah below where it says that if one called the ninth the tenth, the tenth the tenth, and the eleventh the tenth, the eleventh is not holy, since he has not omitted the proper name of the tenth, having counted the tenth as the tenth and not the tenth as the ninth. If, however, he called the tenth the ninth, i.e., if he omitted the proper name of the tenth therefrom, then the eleventh is sacred. The ninth, however, if it has been called the tenth, is sacred even if he called the tenth the tenth, i.e., if he did not omit the name of the tenth therefrom. R. Simeon thereupon comes and says that even the ninth in such circumstances is not sacred etc.');">¹</span>

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