Mishnah for Chullin 120:31
רב אסי רמי כתיב
He prayed; immediately rain came and they began to grow.
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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