49 Grk “and that no one be able to buy or sell.” Because of the length and complexity of the Greek sentence, a new sentence was started here in the translation. Although the ἵνα (hina) is left untranslated, the English conjunction “thus” is used to indicate that this is a result clause.
50 The word “things” is not in the Greek text, but is implied. Direct objects were frequently omitted in Greek when clear from the context. In the context of buying and selling, food could be primarily in view, but the more general “things” was used in the translation because the context is not specific.
51 Grk “except the one who had.”
52 Grk “his name or the number of his name.”

In other versions

so that no one can buy or sell unless he has the mark, that is, the name of the beast or the number of its name.

so that they could not buy or sell unless they had the mark, which is the name of the beast or the number of its name.

so that no one can buy or sell unless he has the mark: the beast’s name or the number of its name.

And no one could buy or sell anything without that mark, which was either the name of the beast or the number representing his name.

and that no one was able to buy or to sell except the one who had the mark—the name of the beast or the number of his name.

And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.

Public Domain