That do His commandments (οἱ ποιοῦντες τὰς ἐντολὰς αὐτοῦ)
Read οἱ πλύνοντες τὰς στολὰς αὐτῶν they that wash their robes. Compare Rev 7:14.
That they may have right to the tree of life (ἵνα ἔσται ἡ ἐξουσία αὐτῶν ἐπὶ τὸ ξύλον τῆς ζωῆς)
Lit., in order that theirs shall be authority over the tree of life. For ἐξουσία right, authority, see on Joh 1:12. Ἑπί may be the preposition of direction: “may have right to come to” (so Rev.) or may be rendered over.