For the LORD is our judge, the LORD is our lawgiver, the LORD is our king; he will save us.
The Lord ... the Lord ... the Lord - thrice repeated, as often; hinting at the Trinity (Numbers 6:24-26).
Judge ... lawgiver ... king - perfect ideal of the theocracy, to be realized under Messiah alone: the judicial, legislative, and administrative functions as king, to be exercised by Him in person (Isaiah 11:4; Isaiah 32:1; James 4:12).