Midrash for Bekhorot 107:9
ומה תירוש ויצהר שאינן כלאים זה בזה אפי' על ידי דבר אחר אין מתעשרין מזה על זה
you must not tithe one for the other, all the more must wine and grain or grain and grain, which are counted as diverse kinds in regard to one another through the sowing of another seed,<span class="x" onmousemove="('comment',' In the case of two kinds of grain, by sowing a vine and in the case of a vine and grain, by sowing barley or wheat.');"><sup>8</sup></span>
Sifrei Devarim
(Devarim 18:4) "The first (i.e., terumah) of your corn": We are hereby taught that terumah is given only of the choicest. "your corn, your wine, and your oil": We are hereby taught that terumah is not given from one for the other. And just as we find that we do not give terumah from two of these kinds from one for the other, so, we do not give terumah from grains and from greens from one kind for the other.
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