Rev., seal up. This word occurs eighteen times in Revelation and twice in the Gospel, and only five times elsewhere in the New Testament. It means to confirm or attest (Joh 3:33); to close up for security (Mat 27:66; Rev 20:3); to hide or keep secret (Rev 10:4; Rev 22:10); to mark a person or thing (Rev 7:3; Eph 1:13; Eph 4:30)