Commentary for Kiddushin 107:8

וכי תימא משום דלא אמר כירושלים והתניא ר' יהודה אומר כל האומר כירושלים לא אמר כלום עד שידור בדבר הקרב בירושלי'

Judah said: He who says: 'Jerusalem', has said nothing.<span class="x" onmousemove="('comment',' I.e., the vow is invalid; v. Ned. (Sonc. ed.) p. 27.');">⁹</span> And should you answer, that is because he did not say: 'As Jerusalem',<span class="x" onmousemove="('comment',' I.e., Jerusalem itself is sanctified, and so a vow that something (e.g., food) shall be as Jerusalem is valid and renders the object forbidden. But R. Judah's reason is that the vower omitted 'as'.');">¹⁰</span> - surely it was taught: R'Judah said: He who says: 'as Jerusalem' has said nothing, unless he relates his vow to that which is sacrificed in Jerusalem!<span class="x" onmousemove="('comment',' For notes v. Ned. (Sonc. ed.) p. 28, n. 3,');">¹¹</span> -

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