<P> "As a dog returns to his vomit, so a fool repeats his folly" is an aphorism which appears in the Book of Proverbs in the Bible--Proverbs 26: 11 (Hebrew: כְּ֭כֶלֶב שָׁ֣ב עַל ־ קֵאֹ֑ו כְּ֝סִ֗יל שֹׁונֶ֥ה בְאִוַּלְתֹּֽו ‎ Kəḵeleḇ šāḇ' al - qê'ōw; kəsîl, šōwneh ḇə'iwwaltōw .), also partially quoted in the New Testament, 2 Peter 2: 22 . It means that fools are stubbornly inflexible and this is illustrated with the repulsive simile of the dog that eats its vomit again, even though this may be poisonous . Dogs were considered unclean in Biblical times as they were commonly scavengers of the dead and they appear in the Bible as repugnant creatures, symbolising evil . The reference to vomit indicates excessive indulgence and so also symbolises revulsion . </P> <P> The incorrigible nature of fools is further emphasised in Proverbs 27: 22, "Though you grind a fool in a mortar, grinding them like grain with a pestle, you will not remove their folly from them ." </P>

What does the bible say about a dog returning to its vomit
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