He made a pit, and digged it, and is fallen into the ditch which he made (comp. Psalms 9:15, Psalms 9:16; Psalms 35:8; Psalms 57:6; Proverbs 26:27; Proverbs 28:10, etc.). There are several illustrations of this law of God's providence in Scripture, the most striking being that of Haman. Its existence as a law was noticed by some of the classical writers, as Ovid, who says—
"Nec lex justior ulla est,
Quam necis artifices arte petite sua."