TRUST Psalm 78:5-7

He decreed statutes for Jacob and established the law in Israel, which he commanded our ancestors to teach their children, so the next generation would know them, even the children yet to be born, and they in turn would tell their children. Then they would put their trust in God and would not forget his deeds but would keep his commands.

He decreed statutes 
Psalm 19:7-9  The law of the LORD is perfect, refreshing the soul. The statutes of the LORD are trustworthy, making wise the simple. The precepts of the LORD are right, giving joy to the heart. The commands of the LORD are radiant, giving light to the eyes. The fear of the LORD is pure, enduring forever. The decrees of the LORD are firm, and all of them are righteous.

for Jacob 
Psalm 147:19-20  He has revealed his word to Jacob, his laws and decrees to Israel. He has done this for no other nation; they do not know his laws. Praise the LORD.

so the next generation would know them, even the children yet to be born 
Psalm 22:30-31  Posterity will serve him; future generations will be told about the Lord. They will proclaim his righteousness, declaring to a people yet unborn: He has done it!

Then they would put their trust in God and would not forget his deeds 
Deuteronomy 6:12  ... be careful that you do not forget the LORD, who brought you out of Egypt, out of the land of slavery.

but would keep his commands 
Deuteronomy 5:28-29  The LORD heard you when you spoke to me (Moses), and the LORD said to me, "I have heard what this people said to you. Everything they said was good. Oh, that their hearts would be inclined to fear me and keep all my commands always, so that it might go well with them and their children forever!"

(parentheses are mine)

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