Reference for Bekhorot 116:32

יכול היו לו מאה ונטל עשרה עשרה ונטל אחד יכול יהיו מעושרין

so as to induce them to go out? - Said R'Huna: This was prohibited<span class="x" onmousemove="('comment',' No other device being adopted except that of placing the mothers outside the shed.');">²²</span>

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