Reference for Menachot 186:14

ובשתי ידים: מנא הני מילי אמר ריש לקיש דאמר קרא (ויקרא טז, כא) וסמך אהרן את שתי ידו כתיב ידו וכתיב שתי זה בנה אב כל מקום שנאמר ידו הרי כאן שתים עד שיפרט לך הכתוב אחת

And if only these two<span class="x" onmousemove="('comment',' I.e., verses excluding the neck and the back.');">²¹</span> had been stated, [I should have said that] the reason [they are excluded] is that they are not included in the rite of waving, but the breast, since it is included in the rite of waving, I would say was not [excluded]. Therefore all [three verses] are necessary.

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