Reference for Bava Metzia 136:1

אמר אביי כפועל בטל של אותה מלאכה דבטל מינה

Abaye said: As a labourer unemployed in his craft.<span class="x" onmousemove="('comment',' E.g., if he was originally a carpenter, who works very hard, and accepted a commission to sell provisions instead on half profits, he must be paid in addition as much as the average man would demand for changing over from strenuous labour to work of a lighter nature. ');">¹</span>

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