Mishnah for Chullin 120:32
(בראשית א, יב) ותוצא הארץ דשא בתלת בשבתא וכתיב
That, he exclaimed, is what R'Assi had taught.
Mishnah Kilayim
They may not graft from one tree to another, or from one vegetable to another, or from a tree to a vegetable, or from a vegetable to a tree. Rabbi Judah permits it from a vegetable to a tree.
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