Psalms 78:5

a testimony … a law Not the Mosaic legislation generally, but the express precept which enjoined upon Israelite parents the duty of teaching their children the great facts of Israel's history, that the remembrance of them might be handed down from generation to generation. See Exodus 10:2; Exodus 12:26-27; Exodus 13:8 ff., Exodus 13:14; Deuteronomy 4:9; Deuteronomy 6:20 ff. Cp. in the N.T. 2 Timothy 2:2.

thatthey should make them known Themrefers to "the things which we have heard and known" &c., Psalms 78:3. Cp. Deuteronomy 4:9.