Reference for Shabbat 270:10

א"ר ירמיה בלוקח שפחה לעוברה

'One bought with money who is circumcised on the eighth [day]': e.g., if one purchases a pregnant female slave and she has a ritual bath and then gives birth; 'one bought with money who is circumcised on the first day': e.g., where one buys a [pregnant] female slave and another buys her unborn child.<span class="x" onmousemove="('comment',' Since the latter does not own the mother, the child is not like a Jewish-born infant, and therefore he is circumcised on the first day. ');">¹⁰</span>

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Bekhor Shor