Reference for Eruvin 55:7

ובגודגדניות מי מערבין והתניא גודגדניות מרובי בנים יאכלו חשוכי בנים לא יאכלו ואם הוקשו לזרע אף מרובי בנים לא יאכלו

He, however, who excludes birds is of the opinion that a first generalization is for principal [consideration] hence [the proposition] is in the form of 'a generalization and a specification' [in which case] the generalization does not cover more than what was enumerated in the specification.<span class="x" onmousemove="('comment',' V. P.B., p. 13.');">¹⁷</span> Consequently it is only these<span class="x" onmousemove="('comment',' Those actually specified.');">²²</span> that are included<span class="x" onmousemove="('comment',' Lit., 'these yes'.');">²³</span> but no other things, while the second generalization<span class="x" onmousemove="('comment',' Cf. supra p. 191, nn. 11 and 12 mutatis mutandis.');">²⁴</span>

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