Adam Clarke on Psalms 80:8

Thou hast brought a vine out of Egypt - This is a most elegant metaphor, and every where well supported. The same similitude is used by Isaiah, Isa 5:1, etc.; by Jeremiah, Jer 2:21; by Ezekiel, Eze 17:5, Eze 17:6; by Hosea, Hos 10:1; by Joel, Joe 1:7; by Moses, Deu 32:32, Deu 32:33; and often by our Lord himself, Mat 20:1, etc.; Mat 21:33, etc.; Mar 12:1, etc. And this was the ordinary figure to represent the Jewish Church. We may remark several analogies here: -

1. This vine was brought out of Egypt that it might be planted in a better and more favorable soil. The Israelites were brought out of their Egyptian bondage that they might be established in the land of Canaan, where they might grow and flourish, and worship the true God.

2. When the husbandman has marked out a proper place for his vineyard, he hews down and roots up all other trees; gathers out the stones, brambles, etc., that might choke the young vines, and prevent them from being fruitful, So God cast out the heathen nations from the land of Canaan, that his pure worship might be established, and that there might not remain there any incitements to idolatry.