Proverbs 20:20 (BSB)

Whoever curses his father or mother, his lamp will be extinguished in deepest darkness.

From Proverbs 20. Also in the ESV.

Commentary on Proverbs 20:20

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 20:20: Here is, 1. An undutiful child become very wicked by degrees. He began with despising his father and mother, slighting their instructions, disobeying their commands, and raging at their rebukes, but at length he arrives at such a pitch of impudence and impiety as to curse them, to give them scurrilous and opprobrious language, and to wish mischief to those that were instruments of his...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Proverbs 20:20: Whoso curseth his father or his mother,.... This is dreadful indeed! a person must be got to a great pitch of wickedness to do this; to curse his parents, one or other of them, that have been the instruments of his being, and by whom he has been brought up and put out into the world; to slight them, despise them, and mock at them...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Proverbs 20:20: his lamp--(Compare Pro 13:9; Pro 24:20).
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 20:20: Pro 20:20 The following group begins, for once more the aim of this older Book of Proverbs becomes prominent, with an inculcation of the fourth commandment. 20 He that curseth his father and his mother, His light is extinguished in midnight darkness. The divine law, Exo 21:17; Lev 20:9, condemns such an one to death.