Revelation 22:14

that do his commandments Read, that wash their robes: cf. Revelation 7:14. The change from one reading to the other is in the Greek only one of a few letters; it seems uncalled for to charge the copyists who introduced the received reading with a wish to substitute justification by works for justification by faith. There are plenty of Scriptural parallels for the sentence, read either way: but there seems to be no doubt which way St John in fact wrote it.

that they may have right Lit. that the right (or power, or license) may be theirs. The right of approaching the Tree of Life is a definite privilege, granted to a certain class, viz. those who "wash their robes."