If you purchase a finished Sefer Torah are you Yotzei the Mitzva of Kesivas Sefer Torah?
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It's a machlokes (dispute among) rishonim. See a talk by Rabbi Josh Flug, and the sources he cites, if you're interested in the machlokes, but I'll note that among Rabbi Flug's points are that Rashi holds purchasing suffices and that Rambam seems to hold it does not; CYLOR if you're interested in the practical halacha.