Related for Chullin 271:51
ראשית אין לך בו אלא ראשית בלבד
Again just as in the case of terumah one must not set aside new [grain as terumah] for old<span class="x" onmousemove="('comment',' The produce of one year may not be given as terumah or tithe for the produce of the preceding year, or vice versa, for it is written: That which is brought forth in the field year by year (Deut. XIV, 22) .');"><sup>36</sup></span>
Tosefta Terumot
We do not take terumah from produce [that is harvested] before it is one-third ripe (cf. Hallah 1:3). How do you know if it is one-third ripe or if not? If it is planted and something has sprouted, it is known that it one-third ripe. If it is planted and something has not sprouted, it is known that it is not one-third ripe.
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