رِسَالَةُ بُطْرُسَ ٱلرَّسُولِ ٱلثَّانِيَةُ 2:22

قَدْ أَصَابَهُمْ مَا فِي ٱلْمَثَلِ ٱلصَّادِقِ: «كَلْبٌ قَدْ عَادَ إِلَى قَيْئِهِ»، وَ«خِنْزِيرَةٌ مُغْتَسِلَةٌ إِلَى مَرَاغَةِ ٱلْحَمْأَةِ».

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.