Reference for Chullin 158:1

וסימנין דאורייתא

and also that the [aforementioned] signs are [reliable by] Biblical law.<span class="x" onmousemove="('comment',' I.e., they may be relied upon in a case of doubt which involves a Biblical law. This opinion therefore would solve the question raised in B.M. 27a, whether the identification marks in a lost article are legally valid by Biblical or merely by Rabbinic law (Rashi) .');">¹</span>

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