Midrash for Chullin 268:10

והרי מתנות דלא טבלי ותניא

- In the case of terumah it is different, for [without setting apart the terumah] the whole is forbidden,<span class="x" onmousemove="('comment',' 'mixed', i.e., untithed produce, which is forbidden to be eaten under the penalty of death at the hands of Heaven.');">⁹</span>

Sifrei Devarim