Commentaries:
Barnes' Notes
Thou hast brought a vine out of Egypt - Referring to his people, under the image (which often occurs in the Scriptures) of a vine or vineyard. See the notes at Isaiah 5:1-7. Compare Jeremiah 2:21; Ezekiel 15:6; Matthew 20:1; Matthew 21:28, Matthew 21:33; Luke 13:6.
Thou hast cast out the heathen - The nations; to wit, the nations that occupied the land of Canaan before the children of Israel dwelt there. See Psalms 2:1, note; Psalms 2:8, note; Psalms 77:15, note.
And planted it - Thou hast established thy people there as one plants a vine in a field. See Psalms 44:2.
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