God expostulates with the Jews for their ingratitude and sins: for which they shall be punished.
6:1. Hear ye what the Lord saith: Arise, contend thou in judgment against the mountains, and let the hills hear thy voice.
The mountains, etc.... That is, the great ones, the princes of the people.
6:2. Let the mountains hear the judgment of the Lord, and the strong foundations of the earth: for the Lord will enter into judgment with his people, and he will plead against Israel.
6:3. O my people, what have I done to thee, or in what have I molested thee? answer thou me.
6:4. For I brought thee up out of the land of Egypt, and delivered thee out of the house of slaves: and I sent before thy face Moses, and Aaron, and Mary.
6:5. O my people, remember, I pray thee, what Balach, the king of Moab, purposed: and what Balaam, the son of Beor, answered him, from Setim to Galgal, that thou mightest know the justice of the Lord.
From Setim to Galgal.... He puts them in mind of the favour he did them, in not suffering them to be quite destroyed by the evil purpose of Balach, and the wicked counsel of Balaam: and then gives them a hint of the wonders he wrought, in order to bring them into the land of Promise, by stopping the course of the Jordan, in their march from Setim to Galgal.
6:6. What shall I offer to the Lord that is worthy? wherewith shall I kneel before the high God? shall I offer holocausts unto him, and calves of a year old?
What shall I offer, etc.... This is spoken in the person of the people, desiring to be informed what they are to do to please God.