Hebrew Bible

Proverbs 26:11

9 Like a thorn has gone up into the hand of a drunkard,so a proverb has gone up into the mouth of a fool. 10 Like an archer who wounds at random, so is the one who hires a fool or hires any passerby. 11 Like a dog that returns to its vomit, so a fool repeats his folly. 12 You have seen a man wise in his own opinion— there is more hope for a fool than for him. 13 The sluggard has said, “There is a lion in the road!A lion in the streets!”

Date: 6th-3rd Centuries B.C.E.
* Dates are based on scholarly estimates
New Testament

2 Peter 2:22

20 For if after they have escaped the filthy things of the world through the rich knowledge of our Lord and Savior Jesus Christ, they again get entangled in them and succumb to them, their last state has become worse for them than their first. 21 For it would have been better for them never to have known the way of righteousness than, having known it, to turn back from the holy commandment that had been delivered to them. 22 They are illustrations of this true proverb: “A dog returns to its own vomit,” and “A sow, after washing herself, wallows in the mire.”

Date: 120-130 C.E.
* Dates are based on scholarly estimates