Reference for Niddah 140:39

הרבה עשו כן ולא הועילו

does not suffice. What must a man do that he may become rich? He replied: Let him engage much in business<span class="x" onmousemove="('comment',' 'Engage&nbsp;… business' is deleted by Elijah Wilna. ');">³⁴</span>

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