Albert Barnes Commentary Psalms 80:8

"Thou broughtest a vine out of Egypt: Thou didst drive out the nations, and plantedst it." — Psalms 80:8 (ASV)

You have 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, 21:33; Luke 13:6.

You have cast out the heathen – The nations; namely, the nations that occupied the land of Canaan before the children of Israel lived there. See Psalms 2:1, note; Psalms 2:8, note; Psalms 77:15, note.

And planted it – You have established your people there as one plants a vine in a field. See Psalms 44:2.