Reference for Bava Kamma 181:17

רקק והגיע בו הרוק והעביר כו': אמר רב פפא לא שנו אלא בו אבל בבגדו לא וניהוי כי בייש בדברים

which proves that the inspection of the instrument is essential also in the case of mere damage? — No; the reason is because we say that it was the slave who frightened himself, as taught: If a man frightens another he is exempt according to the judgments of Man but liable according to the judgments of Heaven; thus if he blew into his ear and deafened him he would be exempt, but if he actually took hold of his ear and blew into it and thus deafened him he would be liable.<span class="x" onmousemove="('comment',' Kid. ibid, and cf. supra 56a. ');">¹⁵</span>

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