The interpretation timeline
Psalm 80:9 Douay-Rheims

Hear, O my people, and I will testify to thee: O Israel, if thou wilt hearken to me,

A.D. 430 – 1771 3 witnesses

Patristic

before A.D. 750
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“"Israel, if you shall have heard Me, there shall not be in you any new god" [Psalm 81:9]. A "new god" is one made for the time: but our God is not new, but from eternity to eternity. And our Christ is new, perchance, as Man, but eternal God. For what before the beginning? And truly, "In the beginning was the Word, and the Word was with God, and the Word was God." [John 1:1] And our Christ Himself is the Word made flesh, that He might dwell in us. [John 1:14] Far be it, then, that there should be in any one a new god. A new god is either a stone or a phantom. He is not, says one, a stone; I have a silver and a gold one. Justly did he choose to name the very costly things, who said, "The idols of the nations are silver and gold." Great are they, because they are of gold and silver; costly they are, shining they are; but yet, "Eyes they have, and see not!" New are these gods. What newer than a god out of a workshop? Yea, though those now old ones spiders' webs have covered over, they that are not eternal are new. So much for the Pagans.. ..”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“Hearken, My people Since I did all this for you, it is fitting for you to hearken to Me.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“There shall no strange god be in thee,.... Or in the midst of thee, owned and worshipped as God; or in thine heart, for whatever engrosses the affection, or a man puts his trust and confidence in, that he makes his god, and is a strange one: thus, if any friend or relation, father or mother, wife or children, are loved more than God, they are set up as such in his place; thus the epicure, that seeks the gratification of his carnal lusts, makes his belly his god; and the covetous man his money, in which he trusts, and therefore is called an idolater; and the self-righteous man his righteousness, on which he depends for salvation: hence we read of idols set up in the heart, from which they are disengaged in conversion, and kept from, Eze 14:7. neither shall thou worship any strange god; only the Lord God is to be worshipped, Mat 28:19 and there is but one God; though this is to be understood not to the exclusion of the Son and Spirit, who are with the Father the one God, and to be worshipped equally with him, and are; see Mat 28:19.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.