Quoting%20commentary for Bekhorot 47:8
רשב"ג אומר
What is the Baraitha [referred to above]? - As it has been taught: If one buys an animal giving suck from a gentile, the young which follows it, is a doubtful firstling,<span class="x" onmousemove="('comment',' For it is possible that the animal had never before given birth, and the fact that it gives milk is not a conclusive proof, as there is a minority which gives milk without having yet given birth. It is thus a doubtful firstling.');"><sup>4</sup></span>
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