Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

يَقولُ اللَّهُ عزّ وجلّ: لَأقْطَعَنَّ أملَ كُلِّ مُؤمنٍ أمَّلَ دُوني بالإياسِ.

'Allah, Mighty and Exalted says, 'I will cut off the expectation of every believer who places it in someone other than Me [and replace it] with despair.'

Source: Sahifat al-Imam al-Rida (AS), p. 276, no. 20