Reference for Yoma 143:5

חושן ואפוד עשרים ושמונה מנא לן דכתיב (שמות כח, טו) ועשית חשן משפט מעשה חושב כמעשה אפוד תעשנו זהב תכלת וארגמן ותולעת שני ושש משזר ארבעה דשיתא שיתא עשרין וארבעה זהב ארבעה הא עשרין ותמניא

- four kinds of material, each sixfold, amount to twenty-four threads, and of the gold, one thread to each of the sixfold threads of the four materials, four [threads], together twenty-eightfold [twine]. Perhaps the gold too was sixfold? - R'Aha B'Jacob said: Scripture said: And they [did beat the gold into thin plates and] cut it into threads - that means four.<span class="x" onmousemove="('comment',' Ibid. XXXIX, 3. Threads being plural means at least two. When these are cut, at least, or-since there is no qualifying suggestion-four.');">⁸</span> R'Ashi said: Scripture states: To work it in the blue and in the purple.<span class="x" onmousemove="('comment',' Ibid. [This implies that there must be an admixture of gold with every kind of material].');">⁹</span>

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