Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

أظهَرُ النّاسِ نِفاقاً مَن أمَرَ بالطّاعَةِ ولَم يَعمَلْ بها، ونَهى‏ عنِ المَعصيَةِ ولَم يَنتَهِ عنها.

'The most obvious of hypocrites is he who enjoins acts of obedience but does not perform them himself, and prohibits wrongdoing but does not refrain from them himself.'

Source: Ghurar al-Hikam, no.3214