Reference for Bava Metzia 232:7
לימא תהוי תיובתא דר"נ דאיתמר מנה לי בידך והלה אומר איני יודע רב הונא ורב יהודה אמרי חייב ר"נ ור' יוחנן אמרי פטור
— It [the debris] had been cleared away. Then let us see who had cleared it away, and ask them! — Public [workers] had cleared it away, and departed. Then let us see in whose possession they are [now] situated, so that the other becomes the claimant, upon whom the onus of proof will lie! — They [the materials] are now in a courtyard belonging to both, or in the street. Alternatively, partners in such matters are not particular with each other.<span class="x" onmousemove="('comment',' Since the house belongs to both, even if they have separate courtyards, neither objects to the other making use of his. Possession in such a case does not prove ownership. ');"><sup>6</sup></span>