A.T. Robertson Commentary Revelation 22:4

"and they shall see his face; and his name [shall be] on their foreheads." — Revelation 22:4 (ASV)

They shall see his face (οψοντα το προσωπον αυτου). Future active of οραω. This vision of God was withheld from Moses (Exodus 33:20,23), but promised by Jesus to the pure in heart (Matthew 5:8) and mentioned in Heb 12:14 as possible only to the holy, and promised in Ps 17:15. Even here on earth we can see God in the face of Christ (2 Corinthians 4:6), but now in the New Jerusalem we can see Christ face to face (1 Corinthians 13:12), even as he is after we are made really like him (2 Corinthians 3:18; Romans 8:29; 1 John 3:2). It is anthropomorphic language, to be sure, but it touches the essential reality of religion. "The supreme felicity is reached, immediate presence with God and the Lamb" (Beckwith).

His name on their foreheads (το ονομα αυτου επ των μετωπων αυτων). As in 3:12; 7:3; 14:1.