Reference for Yoma 144:13

אמר להו רבא לרבנן במטותא מינייכו לא תירתון תרתי גיהנם

and it is also written: And they shall make an ark of acacia wood?<span class="x" onmousemove="('comment',' Ex.XXV, 10.');">¹⁸</span> Hence one learns that the inhabitants of his city are obliged to do the work of the scholar for him.

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