“As Judah’s Lion proved to be the slain Lamb, displaying royal power through the weakness of his sacrifice, so the flock he protects sounds like a precisely numbered, exclusively Israelite army braced for battle but looks like a countless, international crowd celebrating a victory already won. The victory was won by the Lamb when he was slain to purchase this multitude from the peoples to become God’s treasured kingdom of priests (5:5, 9).” (Dennis E. Johnson, Triumph of the Lamb, p. 133 [on Revelation 7]).
“[T]he reason for the picture here is to emphasize the identity of the Lamb with his people. He is the corporate representative of his saints. Therefore, just as he first suffered and received his reward at the resurrection, so his flock follow the same pattern in their own lives (see on 1:5, 9, 20; 2:14). He led them by the Spirit on earth and will lead them in person in the future.” (G. K. Beale, The Book of Revelation, p. 443).
Quotes used in the Reflection for Trinity Presbyterian Church of the OPC.