White robes were given unto every one of them (ἐδόθησαν ἑκάστοις στολαὶ λευκαὶ)
The best texts read ἐδόθη αὐτοῖς ἑκάστῳ στολὴ λευκή there was given them to each one a white robe. So Rev. Στολὴ is properly a long, flowing robe; a festive garment. Compare Mar 16:5; Luk 15:22; Luk 20:46.
Should rest (ἀναπαύσωνται)
See on Mat 11:28; see on 1Pe 5:14; compare Rev 14:13; Dan 12:13. Not merely rest from their crying for vengeance, but rest in peace.
Fellow-servants
See Master in Rev 6:10.
Should be fulfilled (πληρώσονται)
Completed in number. See Col 2:10. Some texts read πληρώσωσιν shall have fulfilled their course.