Charles H. Spurgeon on Psalms 129:3

They made long their furrows. The apparent harshness of this figure will disappear if it be considered to refer to severe public scourgings. To those who have been so unhappy as to witness such scourgings this allusion will then appear most expressive. The long wales or wounds which the scourge leaves at each stroke may most aptly be compared either to furrows or (as the original admits) to the ridges between the furrows. The furrows made by the plough in the East are very superficial, and (although straight) are usually carried to a great length, the fields not being enclosed as in this country. —John Kitto, in "The Pictorial Bible."