Psalms 40:15

“Let them be desolate for a reward of their shame, etc.] Of their shameful wishes, words, and actions, as they were: their habitations in Jerusalem were desolate, and so was their house or temple there, and their whole land, and they themselves were stripped of everything, when Jerusalem was taken and destroyed; (see <402338>Matthew 23:38) (<440120>Acts 1:20); that say unto me, Aha, aha; words expressive of joy, (<193521>Psalm 35:21,25), exulting at his miseries and sufferings on the cross, (<402739>Matthew 27:3944); so the Targum, “we have rejoiced at his destruction, with joy at his affliction.””

“for a reward--literally, "in consequence of." Aha--(Compare Psa 35:21, Psa 35:25).”

“Let them be desolate - The word here employed means to be astonished or amazed; then, to be laid waste, or made desolate. As used here, it refers to their purposes, and the wish or prayer is that they might be wholly unsuccessful, or that in respect to success they might be like a waste and desolate field where nothing grows. For a reward - The word used here - עקב ‛êqeb - means the end, the last of anything; then, the recompence, reward, wages, as being the end, the result, or issue of a certain course of conduct. That is, in this case, the desolation prayed for would be a proper recompence for their purpose, or for what they said. “Of their shame.” Of their shameful act or purpose; their…”

“Shame - Their sinful and shameful actions. Next: Psalms Chapter 41”

“desolate: Psa 69:24, Psa 69:25, Psa 70:3, Psa 73:19, Psa 109:6-20; Luk 19:43, Luk 19:44, Luk 21:23, Luk 21:24 say: Psa 35:21, Psa 35:25, Psa 70:3, Psa 70:4 Psalms 40:16”