Psalms 129

3, 4. The ploughing is a figure of scourging, which most severe physical infliction aptly represents all kinds.

4. the cords--that is, which fasten the plough to the ox; and cutting denotes God's arresting the persecution;

5, 6. The ill-rooted roof grass, which withers before it grows up and procures for those gathering it no harvest blessing ( Ruth 2:4 ), sets forth the utter uselessness and the rejection of the wicked.