Commentaries:
Jamieson, Fausset, and Brown
observest—Thou dost not keep them. The "many things" are the many proofs which all along from the first God had given Israel of His goodness and His power (Deuteronomy 4:32-38; Deuteronomy 29:2-4; Psa. 78:1-72; Psa. 105:1-45).
he—transition from the second to the third person. "Opening . . . ears," that is, though he (Israel) hath his ears open (see on Isaiah 6:10). This language, too (see on Isaiah 42:19), applies to Messiah as Jehovah's servant (Isaiah 50:5; Psalms 40:6).
Other Jamieson, Fausset, and Brown entries containing Isaiah 42:20:
Isaiah 42:18
Isaiah 50:5
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