The believer’s right is on the side of purchase, so the believer was the owner of the suit of permissibility and the suit of obligation, so he took off from himself the suit of permissibility, not the suit of obligation, and both of them are his, so his taking it off is called a sale, and what his clothing due to the obligation is called a purchase, for it is his property, his property, and his possessions, and a person does not buy what he owns, and because God has forbidden misguidance over His creation, and those of them who prefer misguidance to guidance have bought misguidance, for they did not possess it with the guidance that God gave them, so their trade was not profitable, and they were not guided in that purchase, because God did not legislate for His servants to purchase.