Reference for Chullin 183:19

אמר לו רבי יהושע

It was taught: R'Eliezer says: The 'vine' is the world, the 'three branches' are [the patriarchs] Abraham, Isaac and Jacob; 'and as it was budding its blossoms shot forth',<span class="x" onmousemove="('comment',' Gen XL, 10.');">¹⁰</span>

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