The apostle Paul wrote of some Jews in his day who failed to practice what they preached: “Do you,... the one teaching someone else, not teach yourself? ”
وَأَثْنَاءَ ٱلدَّرْسِ ،‏ كَانَتْ عُيُونُهُمُ ٱلصَّغِيرَةُ تُشِعُّ حَمَاسًا وَبَهْجَةً .‏