Reference for Bava Metzia 203:6

מסייע ליה לר' יוסי ברבי חנינא דא"ר יוסי ברבי חנינא חצרו של אדם קונה לו שלא מדעתו

and the landlord's oxen are meant, is it not obvious? — It is necessary to teach this only in respect of a courtyard belonging to the landlord and oxen that had strayed thither from elsewhere.<span class="x" onmousemove="('comment',' And it may be assumed that the owner of the oxen renounces his rights to the dung, and so the courtyard gives the landlord a title thereto. ');">⁶</span>

Jastrow

Jastrow

Rashi on Deuteronomy