<m.Terumoth 8.9>  

If a jar [of Terumah] was broken in the upper part of the wine-press, and the lower part was unclean, both R. Eliezer [T2 or T5] and R. Joshua [T2] agree that if one can save at least a rebi`ith thereof in cleanness he should save it; but if not, R. Eliezer [T2 or T5] says: let it flow down and become unclean of its own accord, and let him not make it unclean with his own hands.

(Purchase a printed Mishnah)