Charles H. Spurgeon on Psalms 129:6

Like grass upon the housetops. The flat roofs of the Eastern houses "are plastered with a composition of mortar, tar, ashes, and sand", in the crevices of which grass often springs. The houses of the poor in the country were formed of a plaster of mud and straw, where the grass would grow still more freely: as all the images are taken from country life, it is doubtless to country dwellings that the poet refers. —J. J. Stewart Perowne.