Talmud for Menachot 75:8
לימא דלא כרבי אמר רב יהודה אמר רב אפי' תימא רבי לא נצרכא אלא לקדם
and then the Divine Law says.' That ye may look upon it', that is, both must be there together as one.
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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