Reference for Shabbat 296:17

והא תני רבי הושעיא הולך אדם אצל רועה הרגיל אצלו ונותן לו טלה לפסחו ומקדישו ויוצא בו התם נמי כיון דרגיל אצלו אקדושי ליה מעיקרא והא מקדיש קתני הקדש עילוי מדרבנן

devote,<span class="x" onmousemove="('comment',' Heb. [H], i.e. renounce an object by dedicating it absolutely for priestly use; v. Lev. XXVII, 28f. ');">²⁹</span> or separate terumoth and tithes: all these were said of Festivals, and how much more so of the Sabbath! — There is no difficulty: One refers to obligatory offerings for which there is a fixed time;<span class="x" onmousemove="('comment',' E.g., the Passover sacrifice and Festive offerings. Such may be sanctified on the Sabbath and Festivals, as otherwise the obligation must remain unfulfilled. ');">³⁰</span>

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