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

واللَّهِ، ما أرى‏ عَبداً يَتَّقي تَقوىً تَنفَعُهُ حتّى‏ يَخزِنَ لِسانَهُ.

'By Allah, I cannot see a servant ever having Godwariness that will benefit him unless he guards his tongue.'

Source: Nahj al-Balagha, Sermon 176