Thou hast brought a vine out of Egypt— The Psalmist, whoever he was, describing the Israelites under the simile of a vine, continues the metaphor to a considerable length, and carries it on very happily through the several particulars. Among the many excellencies with which this allegory abounds, that nicety observable both in the beginning and close of it, is not the least; the author sliding, as it were, from the comparison into the subject itself, and from thence into the comparison, by an almost insensible gradation. Thou hast brought a vine, &c. See Bishop Lowth's 10th Prelection.
Related Commentaries of Psalms 80:8
Psalms 80:8
8 Thou hast brought a vine out of Egypt: thou hast cast out the heathen, and planted it.