God's Goodness and Israel's Waywardness
81 1 Sing for joy to God our strength; shout aloud to the God of Jacob! 2 Begin the music, strike the timbrel, play the melodious harp and lyre. 3 Sound the ram's horn at the New Moon, and when the moon is full, on the day of our festival; 4 this is a decree for Israel, an ordinance of the God of Jacob. 5 When God went out against Egypt, he established it as a statute for Joseph. I heard an unknown voice say: 6 "I removed the burden from their shoulders; their hands were set free from the basket. 7 In your distress you called and I rescued you, I answered you out of a thundercloud; I tested you at the waters of Meribah.
81:1 In Hebrew texts 81:1-16 is numbered 81:2-17.
81:1 Title: Probably a musical term
81:7 The Hebrew has "Selah" (a word of uncertain meaning) here.