Imam Hussain says to Sayida Zainab: “Sister fear Allah, and take comfort in the consolotion of Allah. Know that the people on earth will die and the inhabitants of heaven will not continue to exist (for ever). For everything will perish except the face of Allah Who created creation by His power (qudra). Hu sends forth creation and Hu causes them to return. Hu is unique and alone. ” (attributed in Kitab al-Irshad)
