Midrash for Bava Metzia 58:21

איבעית אימא לא קשיא הא בידא והא בחוטרא

'Likewise, if one deposits a Scroll of the Torah with his neighbour, he [the latter] must roll it once every twelve months, and may open and read it.' What business has he with it?<span class="x" onmousemove="('comment',' It was assumed that he may open and read it for his own purpose, since it was already taught once that he rolls it every twelve months for its own benefit; but how may one use a bailment in his own interests? ');">¹⁷</span>

Sifrei Devarim