Reference for Bekhorot 85:21

ומה ילפת דלא מאיסא הוי מומא גרב דמאיס לא כל שכן

The text states 'garab', [a dry scab], [in connection with a human being] and repeats 'garab' [in connection with an animal]; also 'yallefeth', [lichen] is stated [in connection with a human being] and 'yallefeth' is repeated [in connection with an animal], in order to conclude a gezarah shawah.<span class="x" onmousemove="('comment',' An analogy based on a similarity of expression. V. Glos.');">¹²</span>

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