John Calvin's Commentary on the Bible - Psalms 78:3
Verse 3 3.What we have heard and known. There seems to be some discrepancy between what the Psalmist had stated in the commencement, when he said that he would speak of great and hidden matters, and what he now adds, that his subject is a common one, and such as is transmitted from one age to another by the father to the son. If it was incumbent upon the fathers to recount to their children the things here spoken of, these things ought, of course, to have been familiarly known to all the... read more
Adam Clarke's Commentary on the Bible - Psalms 78:6
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... read more