Psalms 129:6

“Let them be as the grass [upon] the housetops, etc.] The tops of the houses in Judea were flat, and so grass grew upon them, being covered with plaster of terrace; though it was but small and weak, and being on high was exposed to the scorching sun, and soon witheredf1774; and Menochius saysf1775 he saw such roofs in the island of Corsica, flat, and having earth upon them, smoothed and pressed, on which grass grew of its own accord; but being burnt up in summertime by the sun, soon withered, as here said. But what Olaus Magnusf1776 relates is somewhat extraordinary; that, in the northern Gothic countries, they feed their cattle on the tops of houses, especially in a time of siege; he…”

“Let them be as the grass upon the housetops - The housetops, or roofs of houses, covered with sand or earth, in which seeds of grass may germinate and begin to grow, but where, as there is no depth of earth, and as the heat of the sun there would be intense, it would soon wither away. See the notes at Isaiah 37:27. Which withereth afore it groweth up - This, even if it has any meaning, is not the meaning of the original. The idea in the Hebrew is - and it is so rendered in the Septuagint, the Latin Vulgate, and by Luther - “which before (one) pulls it, withers.” Grass would wither or dry up, of course, if it were pulled up or cut down, but the grass here spoken of withers even before this is…”

“House - tops - Which there were flat. Which - Having no deep root, never comes to maturity. And so all their designs shall be abortive. Psalms 129:8”

“129:6-8 Grass on a rooftop had shallow roots and would scorch easily. A crop was ignored by the harvester when the yield was low. The enemies who had sown hurt among God’s people would gain little.”

“as the grass: Psa 37:2, Psa 92:7; Jer 17:5, Jer 17:6; Mat 13:6 Psalms 129:7”

“The poet illustrates the fate that overtakes them by means of a picture borrowed from Isaiah and worked up ( Psa 37:27): they become like "grass of the housetops," etc. שׁ is a relative to יבשׁ (quod exarescit), and קדמת, priusquam, is Hebraized after מן־קדמת דּנה in Dan 6:11, or מקּדמת דּנה in Ezr 5:11. שׁלף elsewhere has the signification "to draw forth" of a sword, shoe, or arrow, which is followed by the lxx, Theodotion, and the Quinta: πρὸ τοῦ ἐκσπασθῆναι, before it is plucked. But side by side with the ἐκσπασθῆναι of the lxx we also find the reading exanthee'sai; and in this sense Jerome renders (statim ut) viruerit, Symmachus ἐκκαυλῆσαι (to shoot into a stalk), Aquila…”