Reference for Menachot 76:1

אילימא חיסר מצוה דלבן וקיים מצוה דתכלת לרבי עכובי מעכב אהדדי

Should you say it means that he has not fulfilled the precept of the white [threads] but has fulfilled the precept of the blue, but according to Rabbi the absence of one invalidates the other!<span class="x" onmousemove="('comment',' Since it is considered as though the precept of the white threads had not been fulfilled at all, this omission according to Rabbi impairs the validity of the blue; how then can it be said that if the proper precedence was not adhered to it it is still valid?');">¹</span>

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