Reference for Bava Kamma 197:7

אמר רב מרי בריה דרב כהנא בגרדא דסרבלא דליכא שבחא

But if [the craftsman] delivered the garment to him in the middle of the day, as soon as the sun set [without payment having been made] the owner would through that transgress the injunction. Thou shalt not keep all night.<span class="x" onmousemove="('comment',' V. p. 576, n. 11. ');">¹³</span> Now, if you assume that a craftsman acquires title to the improvement [carried out by him] on any article,<span class="x" onmousemove="('comment',' So that when he parts with it he effects a sale of the improvement of the article and the stipulated sum paid to him is but the purchase money for the same. ');">¹⁴</span>

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