Psalm 81:3-5

New International Reader's Version

³ Blow the ram’s horn on the day of the New Moon feast.
    Blow it again when the moon is full and the Feast of Booths begins.
⁴ This is an order given to Israel.
    It is a law of the God of Jacob.
⁵ He gave it as a covenant law for the people of Joseph.
    It was given when God went out to punish Egypt.
    There I heard a voice I didn’t recognize.