Reference for Yoma 77:1

בא למדוד נפט אומר לו מדוד אתה לעצמך בא למדוד אפרסמון אומר לו המתן לי עד שאמדוד עמך כדי שנתבסם אני ואתה

If [a purchaser] comes to measure naphtha, he [the shopkeeper] says to him: Measure it out for yourself; but to one who would measure out balm he says: Wait, till I measure together with you, so that both I and you, may become perfumed. The school of R'Ishmael taught: Sin dulls the heart of man, as it is said: Neither shall ye make yourselves unclean with them, that ye should be defiled thereby.<span class="x" onmousemove="('comment',' Lev. XI, 43. o,nybu o,nybu oynybu');">¹</span>

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