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

يا عِبادَ اللَّهِ، ما بعدَ المَوتِ لِمَن لم يُغفَرْ لَهُ أشدَّ مِن المَوتِ؛ القَبرُ، فاحذَرُوا ضِيقَهُ وضَنكَهُ وظُلمَتَهُ وغُربَتَهُ... وإنّ المَعيشَةَ الضَّنْكَ الّتي حَذَّرَ اللَّهُ مِنها عَدُوَّهُ عَذابُ القَبرِ.

'O servants of Allah! That which comes after death for those who have not been forgiven is worse than death itself and it is the grave. So, be warned of its tightness, its hardship, its darkness and its loneliness ..... And the hard life that Allah has warned His enemies about is the punishment of the grave.'

Source: Amali al-Tusi, p. 28, no. 31