John Gills Exposition of the Bible Commentary - Psalms 81:4
For this was a statute for Israel ,.... It was not a piece of will worship, or device of the children of Israel, but was of divine institution; that the passover should be kept at the time it was; and that the trumpets should be blown on the new moon, or first of Tisri; and that the feast of tabernacles should be kept on the fifteenth of the same month: and a law of the God of Jacob ; and therefore to be observed by Jacob's posterity: the law for the one is in Exodus 12:18 and for the... read more
Matthew Henry's Complete Commentary - Psalms 81:1-7
When the people of God were gathered together in the solemn day, the day of the feast of the Lord, they must be told that they had business to do, for we do not go to church to sleep nor to be idle; no, there is that which the duty of every day requires, work of the day, which is to be done in its day. And here, I. The worshippers of God are excited to their work, and are taught, by singing this psalm, to stir up both themselves and one another to it, Ps. 81:1-3. Our errand is, to give unto... read more