Reference for Yevamot 10:1
מקרא קמא אם כן לימא קרא ציצית תעשה לך גדילים למה לי ש"מ לאפנויי
from the first cited text:<span class="x" onmousemove="('comment',' 'Mingled stuff' in the case of zizith. (V. Deut. XXII, 11, 12 and supra p. 15, n. 3). ');"><sup>1</sup></span> Since<span class="x" onmousemove="('comment',' Lit., 'if so', i.e., if according to the Rabbis the expression, 'wool and linen', is required for its own context and that text, therefore, is not available for deduction. ');"><sup>2</sup></span> Scripture could have used the expression, Thou shalt make thee fringes,<span class="x" onmousemove="('comment',' The expression used in Num. XV, 38 in the section dealing with the precept of the fringes. ');"><sup>3</sup></span> what need was there for that of 'twisted cords'? Consequently it must have been intended for the purpose of allowing that text to be used for the deduction.<span class="x" onmousemove="('comment',' That a positive precept supersedes a prohibition. Cf. supra, p. 10, n. 13. ');"><sup>4</sup></span>
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