Isaiah 55:4 - Ellicott's Commentary On The Whole Bible

I have given him... — Better, I gave, the words referring primarily to the historic David (Comp. Psalms 78:70-71), though realised fully only in Him who was the “faithful and true witness” (John 18:37; Revelation 1:5; Revelation 3:14), the “captain” or “leader” of our salvation (Hebrews 2:10).