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Isaiah 55:4
Behold, I have given him for a witness to the people, a leader and commander to the people. (Isaiah 55:4)
A leader.
 Heb. nagid, “chief,” “leader,” “captain,” “ruler,” “prince” (see 1 Sam. 10:1; 13:14; 1 Kings 1:35; 1 Chron. 5:2; 28:4; Dan. 9:25).
I have given him.
 That is, David (v. 3), who was a type of Christ and upon whose throne Christ was to sit (Ps. 89:3, 4, 20, 35-37; Eze. 34:23, 24; Hosea 3:5; see on Deut. 18:15; Matt. 1:1). For the selection of David as an example of the experience of one who enters fully into the privileges and responsibilities of the covenant relationship, see p. 31.