Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:
لو كانَ الإيمانُ كلاماً لم يَنْزِلْ فيهِ صَومٌ ولا صلاةٌ ولا حلالٌ ولا حرامٌ.
'If faith was a mere statement, then fasting, prayers, the lawful and the unlawful things would not have been prescribed for it.'
Source: Bihar al-Anwar, v. 69, p. 19, no. 2