That the generation to come might know them ... - That people in future times might enjoy the benefit of them as their fathers had done, and that they should then send them forward to those who were to succeed them.

Who should arise and declare them to their children - Who, as they appeared on the stage of life, should receive the trust, and send it onward to future ages. Thus the world makes progress; thus one age starts where the previous one left off; thus it enters on its own career with the advantage of all the toils, the sacrifices, the happy thoughts, the inventions of all past times. It is designed that the world shall thus grow wiser and better as it advances; and that future generations shall be enriched with all that was worth preserving in the experience of the past. See the notes at Psalm 71:18.

A testimony in Jocob - This may signify the various ordinances, rites, and ceremonies prescribed by the law; and the word law may mean the moral law, or system of religious instruction, teaching them their duty to God, to their neighbor, and to themselves. These were commanded to the fathers - the patriarchs and primitive Hebrews, that they should make them known to their children, who should make them known to the generation that was to come, whose children should also be instructed that they might declare them to their children; to the end that their hope might be in God, that they might not forget his works, and might keep his commandments: that they might not be as their fathers, but have their heart right and their spirit steadfast with God, Psalm 78:6-8. Five generations appear to be mentioned above: 1. Fathers; 2. Their children; 3. The generation to come; 4. And their children; 5. And their children. They were never to lose sight of their history throughout all their generations. Some think the testimony here may mean the tabernacle.

That the generation to come might know them,.... Not only notionally, but spiritually and experimentally; which is the case, when human teachings are attended with the spirit of wisdom and revertion in the knowledge of divine truths; for the truths of the Gospel are unknown to men; the Gospel is hidden wisdom, the wisdom of God in a mystery; the Bible is a sealed book, the doctrines of it are riddles and dark sayings; the ministry of the word is the means of knowledge, which become effectual when attended with the Spirit and power of God:

even the children which should be born, who should arise and declare them to their children; and so be transmitted from age to age: it is the will of God, that, besides private instructions, there should be a standing ministry kept up in all ages, to the end of the world; and he will have some that shall receive the Gospel, and profess his name; there has been and will be a succession of regenerate persons; instead of the fathers come up the children, a seed to serve the Lord, accounted to him for a generation; the seed and the seed's seed of the church, from whose mouth the word of God shall never depart; but they shall declare it one to another, by which means it shall be continued to the latest posterity, Psalm 22:30.

That the {e} generation to come might know them, even the children which should be born; who should arise and declare them to their children:

(e) He shows how the children would be like their father's: that is, in maintaining God's pure religion.

78:1-8 These are called dark and deep sayings, because they are carefully to be looked into. The law of God was given with a particular charge to teach it diligently to their children, that the church may abide for ever. Also, that the providences of God, both in mercy and in judgment, might encourage them to conform to the will of God. The works of God much strengthen our resolution to keep his commandments. Hypocrisy is the high road to apostacy; those that do not set their hearts right, will not be stedfast with God. Many parents, by negligence and wickedness, become murderers of their children. But young persons, though they are bound to submit in all things lawful, must not obey sinful orders, or copy sinful examples.