Midrash for Bekhorot 107:7
עד שיזרע חטה ושעורה וחרצן במפולת יד היכי מייתי לה
But according to the opinion of R'Josaiah who said: [The law of diverse kinds does not apply] until one has sowed a wheat-seed, a barley-seed and a grape kernel with one and the same throw, how can you adduce this [argument]?<span class="x" onmousemove="('comment',' Since three seeds are necessary to cause 'diverse kinds', a mixture of two different grains or a mixture of vine and grain does not constitute 'diverse kinds'.');"><sup>6</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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