Midrash for Bekhorot 107:5
תירוש ודגן דגן ודגן שהם כלאים זה בזה אינו דין שלא יתעשרו מזה על זה
you must not tithe one for the other, all th more must wine and grain or grain and grain, which are counted as diverse kinds in regard to one another,<span class="x" onmousemove="('comment',' A mixture of two kinds of grain constitutes 'diverse kinds' rabbinically. A mixture also of grain and vine constitutes 'diverse kinds' of the vineyard and is biblically forbidden.');"><sup>5</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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