Reference for Bava Metzia 52:11

<big><strong>גמ׳</strong></big> אמר רבי אלעזר אפילו מונחין על גבי שולחן

If he picks it up before abandonment, intending to return it, but after abandonment decides to appropriate it, he violates [the injunction,] thou shalt restore them.<span class="x" onmousemove="('comment',' Because 'thou shalt not rob' is applicable only when the action itself is committed with that intention. [Nor is the injunction. 'thou mayest not hide thyself' applicable where the desire to appropriate it came to him after abandonment; v. Rashi and Tosaf.] ');">¹⁰</span>

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