Reference for Bava Metzia 51:2

בכותל חדש מחציו ולחוץ שלו מחציו ולפנים של בעל הבית:

IN A NEW WALL: IF IN THE OUTER HALF [THEREOF], IT IS HIS; IN THE INNER HALF, IT BELONGS TO THE OWNER OF THE HOUSE. R. Ashi said: A knife follows its handle, and a purse its straps.<span class="x" onmousemove="('comment',' If a knife is found in a wall cavity, if the handle points inwards, it belongs to the owner of the house; outwards, it is assumed to have been placed there by a passer-by; similarly with a purse and its straps or laces. ');">²</span>

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