Whither the tribes go up, the tribes of the LORD, unto the testimony of Israel, to give thanks unto the name of the LORD.
The tribes — Whom God has chosen to be his people.
Unto — Unto the ark, called the testimony, because of the tables of the covenant laid up in it, which are called God's testimony, and the tables of the testimony. And this is called the testimony of, or to Israel, because it was given by God to them.
Give thanks — To worship God; this one eminent part thereof being put for all the rest.
 For there are set thrones of judgment, the thrones of the house of David.
Judgment — The supreme courts of justice for ecclesiastical and civil affairs.
Thrones — The royal throne allotted by God to David and to his posterity, and the inferior seats of justice under his authority.