Psalms 81:5

a testimony--The feasts, especially the passover, attested God's relation to His people. Joseph--for Israel (Ps 80:1). went out through--or, "over," that is, Israel in the exodus.

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This he ordained in Joseph for a testimony. The nation is called Joseph, because in Egypt it would probably be known and spoken of as Joseph's family, and indeed Joseph was the foster father of the people. The passover, which is probably here alluded to, was to be a standing memorial of the redemption from Egypt; and everything about it was intended to testify to all ages, and all peoples, the glory of the Lord in the deliverance of his chosen nation. When he went out through the land of Egypt. Much of Egypt was traversed by the tribes in their exodus march, and in every place the feast which they had kept during the night of Egypt's visitation would be a testimony for the Lord, who had also himself in the midnight slaughter gone forth through the land of Egypt. The once afflicted Israelites marched over the land of bondage as victors who trample down the slain. Where I heard a language that I understood not. Surely the connection requires that we accept these words as the language of the Lord. It would be doing great violence to language if the "I" here should be referred to one person, and the "I" in the next verse to another. But how can it be imagined that the Lord should speak of a language which he understood not, seeing he knows all things, and no form of speech is incomprehensible to him? The reply is, that the Lord here speaks as the God of Israel identifying himself with his own chosen nation, and calling that an unknown tongue to himself which was unknown to them. He had never been adored by psalm or prayer in the tongue of Egypt; the Hebrew was the speech known in his sacred house, and the Egyptian was outlandish and foreign there. In strictest truth, and not merely in figure, might the Lord thus speak, since the wicked customs and idolatrous rites of Egypt were disapproved of by him, and in that sense were unknown.

I heard a language I understood not - This passage is difficult. Who heard? And what was heard? All the Versions, except the Chaldee, read the pronoun in the third person, instead of the first. “He heard a language that he understood not.” And to the Versions Kennicott reforms the text, שפת לא ידעה ישמע sephath lo yadah yisma; “a language which he did not understand he heard.” But what was that language? Some say the Egyptian; others, who take Joseph to signify the children of Israel in general, say it was the declaration of God by Moses, that Jehovah was the true God, that he would deliver their shoulder from their burdens, and their hands from the pots - the moulds and furnaces in which they formed and baked their brick.

This he ordained in Joseph for a testimony - literally, he placed this; that is, he appointed it. The word Joseph here stands for the whole Hebrew people, as in Psa 80:1. See the notes at that verse. The meaning is, that the ordinance for observing this festival - the Passover - was to be traced back to the time when they were in Egypt. The obligation to observe it was thus enhanced by the very antiquity of the observance, and by the fact that it was one of the direct appointments of God in that strange and foreign land. When he went out through the land of Egypt - Margin, against. Or rather, In his going out of the land of Egypt. Literally, In going upon the land of Egypt. The allusion is, undoubtedly, to the time when the Hebrews went out of the land of Egypt - to the Exodus; and the exact idea is, that, in doing this, they passed over a considerable portion of the land of Egypt; or, that they passed over the land. The idea in the margin, of its being against the land of Egypt, is not necessarily in the original. Where I heard a language that I understood not - literally, “The lip, that is, the language, of one that I did not know, I heard.” This refers, undoubtedly, not to God, but to the people. The author of this psalm identifies himself here with the people - the whole nation - and speaks as if he were one of them, and as if he now recollected the circumstances at the time - the strange language - the foreign customs - the oppressions and burdens borne by the people. Throwing himself back, as it were, to that time (compare the notes at 1Th 4:17) - he seems to himself to be in the midst of a people speaking a strange tongue - a language unintelligible to him - the language of a foreign nation. The Jews, in all their long captivity in Egypt - a period of four hundred years (see the notes at Act 7:6) - preserved their own language apparently incorrupt. […]