Proverbs 26:2 (BSB)

Like a fluttering sparrow or darting swallow, an undeserved curse does not come to rest.

From Proverbs 26. Also in the ESV.

Commentary on Proverbs 26:2

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 26:2: Here is, 1. The folly of passion. It makes men scatter causeless curses, wishing ill to others upon presumption that they are bad and have done ill, when either they mistake the person or misunderstand the fact, or they call evil good and good evil. Give honour to a fool, and he thunders out his anathemas against all that he is disgusted with, right or wrong.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Proverbs 26:2: As the bird by wandering, as the swallow by flying,.... As a bird, particularly the sparrow, as the word (h) is sometimes rendered, leaves its nest and wanders from it; and flies here and there, and settles nowhere; and as the swallow flies to the place from whence it came; or the wild pigeon, as some (i) think is meant, which flies away very swiftly...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Proverbs 26:2: Though not obvious to us, the bird--literally, "sparrow"--and swallow--have an object in their motions, so penal evil falls on none without a reason.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Proverbs 26:1-3: He that [hath] no rule over his own spirit [is like] a city [that is] broken down, [and] without walls. (q) And so is in extreme danger.