Reference for Menachot 158:2

אמר מר אם יש זבח אחר יקרבו עמו והא אמר רב חסדא שמן שהפרישו לשום מנחה זה פסול לשום מנחה אחרת אמר רבי ינאי לב בית דין מתנה עליהם אם הוצרכו הוצרכו ואם לאו יהו לזבח אחר

But has not R'Hisda ruled that oil which had been set apart for one meal-offering is invalid for another meal-offering? - R'Jannai answered, The Beth din make a mental stipulation about [the drink-offerings]<span class="x" onmousemove="('comment',' This relates, of course, only to communal offerings. By 'Beth din' is meant here the Temple authorities, the priests.');">²</span> that if they are required, they are required [and utilized for that offering]; but if not, they shall be utilize another offering.

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