Psalms 78:2-7 (ESV) - I will open my mouth

  (2) I will open my mouth in a parable; I will utter dark sayings from of old,  (3)  things that we have heard and known, that our fathers have told us.  (4)  We will not hide them from their children, but tell to the coming generation the glorious deeds of the LORD, and his might, and the wonders that he has done.  (5)  He established a testimony in Jacob and appointed a law in Israel, which he commanded our fathers to teach to their children,  (6)  that the next generation might know them, the children yet unborn, and arise and tell them to their children,  (7)  so that they should set their hope in God and not forget the works of God, but keep his commandments;