Commentaries:
Jamieson, Fausset, and Brown
Confirmation of His promises to the Church and Israel, by various instances of His omnipotence; among these the restoration of the Jews by Cyrus.
alone—literally, "Who was with Me?" namely, when I did it; answering to "by Myself," in the parallel clause (compare similar phrases, Hosea 8:4; John 5:30) [MAURER].
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