John Gill Commentary Psalms 37:2

"For they shall soon be cut down like the grass, And wither as the green herb." — Psalms 37:2 (ASV)

For they shall soon be cut down like the grass, and wither as
the green herb .
] Which in the morning looks green, pretty, and flourishing, and in the evening is cut down, and then fades away; see (Psalms 90:5Psalms 90:6) ; and so the wicked prosper and flourish for a while, and then they perish with all their honour, riches, and wealth; so that their happiness is a very short lived one, and therefore need not be envied and fretted at.