Commentary for Menachot 79:7
כדריש לקיש דאמר ריש לקיש כל מקום שאתה מוצא עשה ולא תעשה אם אתה יכול לקיים את שניהם מוטב ואם לאו יבוא עשה וידחה את לא תעשה
well and good, otherwise let the positive precept come and override the negative one. But it can be examined,<span class="x" onmousemove="('comment',' Every blue thread can be subjected to a test so as to ascertain whether the blue dye is genuine or imitation; v. infra 42b. According to another interpretation given in Rashi, the purchaser of the blue thread can inspect the dye in the pan of the dyer in order to ascertain whether the dye is genuine or not.');"><sup>12</sup></span>
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