For he established a testimony in Jacob, and appointed a law in Israel, which he commanded our fathers, that they should make them known to their children:
Ver. 5. For he established a testimony in Jacob, &c.] Lest any should attribute too much to ancient traditions, and to show that antiquity must have no more authority than what it can maintain; the psalmist here (as afterwards the prophet Isaiah) calleth them to the law and to the testimonies; for if any speak not according to this word, it is because there is no light in them, Isaiah 8:20 .