Talmud for Menachot 75:1
בלאו (דברים יז, יא) דלא תסור
as referring to the prohibition, Thou shalt not turn aside.<span class="x" onmousemove="('comment',' Sc. from the sentence which they shall declare unto thee, Deut. XVII, 11. I.e., the principle is that only a Rabbinic prohibition, though having for its sanction this verse in the Torah, can be set aside on account of man's dignity. ,hknrf');"><sup>1</sup></span> Another version states that [Rabina] told him of it there [in the street]; whereupon [Mar] said to him, 'Do you think that I am going to cast it off here?
Tractate Tzitzit
Leaving out [from the zizith] the blue threads though not the white ones, or the white threads though not the blue ones, invalidates them because [the absence of] either the blue or the white invalidates the other. R. [Ishmael]16The name is added in H. maintains: The absence of one does not invalidate the other.
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