2 Peter 2:22
It has happened to them according to the true proverb: A dog returns to its own vomit,
Proverbs 26:11
                            
so a fool repeats his foolishness.
Treasury of Scripture Knowledge
Summary
                            But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.                        
                    The dog
Bible References
The dog
                                        Proverbs 26:11                                        As a dog returns to its vomit,
so a fool repeats his foolishness.
 
                                    
                                                            
                        so a fool repeats his foolishness.
General references
                                        Genesis 24:6                                        
                                                                                                                                Abraham answered him, “Make sure that you don’t take my son back there. 
                                    
                                        Leviticus 14:43                                        
                                                                                                                                “If the contamination reappears in the house after the stones have been pulled out, and after the house has been scraped and replastered, 
                                    
                                        Numbers 14:4                                        
                                                                                                                                So they said to one another, “Let’s appoint a leader and go back to Egypt.” 
                                    
                                        Deuteronomy 14:7                                        
                                                                                                                                But among the ones that chew the cud or have divided hooves, you are not to eat these:
the camel, the hare, and the hyrax,
though they chew the cud, they do not have hooves—
they are unclean for you;
 
                                    though they chew the cud, they do not have hooves—
they are unclean for you;
                                        Jeremiah 34:11                                        
                                                                                                                                Afterward, however, they changed their minds and took back their male and female slaves they had freed and forced them to become slaves again. 
                                    
                                        Ezekiel 33:18                                        
                                                                                                                                When a righteous person turns from his righteousness and commits iniquity, he will die on account of this. 
                                    
                                        Matthew 7:27                                        The rain fell, the rivers rose, the winds blew and pounded that house, and it collapsed. And its collapse was great!”  
                                    
                                                                                                                                
                                        Luke 14:30                                        saying, ‘This man started to build and wasn’t able to finish.’  
                                    
                                                                                                                                
                                        Luke 17:32                                        Remember Lot’s wife!   
                                    
                                                                                                                                
                                        1 Timothy 5:15                                        
                                                            
                        For some have already turned away to follow Satan.