Musar for Shabbat 296:1
ניפרוס סודרא אתי לידי סחיטה נכסייה בנכתמא זימנין דמיפסק ואתי למקטריה הלכך לא אפשר
Shall one spread a cloth? then he may come to wring it out. Shall one cover it with a lid? it [the string wherewith it is tied] may break and he will come to knot it.<span class="x" onmousemove="('comment',' With a permanent knot, which is forbidden. ');"><sup>1</sup></span> Therefore it is impossible.
Orchot Tzadikim
And they said: Just as it is a commandment to say a thing that will be heard, so is it a commandment not to say a thing that will not be heard (Yebamoth 65b). And our Sages said, "Better that they (the sinners) should commit a wrong not knowing that it is a wrong, than that they should commit that wrong intentionally" (Shabbath 148b).
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