Reference for Bava Metzia 167:3

כי הוו מקלעי ר' ישמעאל ברבי יוסי ור' אלעזר בר' שמעון בהדי הדדי הוה עייל בקרא דתורי בינייהו ולא הוה נגעה בהו

When R. Ishmael son of R. Jose and R. Eleazar son of R. Simeon met, one could pass through with a yoke of oxen under them and not touch them.<span class="x" onmousemove="('comment',' Their waists were so large that as they stood waist to waist there was room for a yoke of oxen to pass beneath them! ');">²</span>

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