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

لا يجِدُ عبدٌ طعمَ الإيمانِ حتّى‏ يترُكَ الكذبَ هَزْلَهُ وجِدَّه.

'A servant will never savour the taste of faith until he abandons lying, both in jest and earnestness.'

Source: Bihar al-Anwar, v. 72, p. 249, no. 14