Ali's admonition on piety and the afterlife
Nahj al-Balāgha|Volume 1|Book 3|Chapter 370
۳۷۰. وَرُوِيَ أَنَّهُ (عليه السلام) قَلَّمَا اعْتَدَلَ بِهِ الْمِنْبَرُ إِلَّا قَالَ أَمَامَ الْخُطْبَةِ:
370. It is related that it was seldom that Amīr al-mu’minīn, peace be upon him, ascended the pulpit and did not utter the following before his sermon: