For the source text click/tap here: Bava Metzia 46
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Steinsaltz "How can someone purchase or take possession of something according to Jewish law?
This is one of the central issues dealt with by Perek HaZahav, the fourth perek of Massekhet Bava Metzia. The first Mishna in the perek (44a) discusses the purchase of moveable objects, and specifically the status of money (i.e. coins) that is used to buy things.
Somewhat surprisingly, Jewish law does not recognize the validity of a kinyan – a purchase – made with money, unless the buyer also takes possession – at least symbolically – of the object that he purchased.
We review the sugya of Kinyan chalipin.