Isa 40:5

40:5 revealed. God’s kingdom is “revealed” in acts of salvation and judgment, especially in Jesus Christ (Luke 2:30, 31; John 1:14). The restoration from exile was a manifestation of God’s glory.

all flesh . . . together. The revelation of His kingdom is public and visible in creation, in Christ, in the church, and in the new earth (Gen. 9:17; Matt. 2:1–11; 16:27; 24:30; Acts 28:28; 2 Cor. 3:18).

mouth. See note 1:20. This affirmation is expanded in vv. 6–8.