Imam Muhammad Baqir (a.s) says that Mola Ali (a.s) Ibn e Abu Talib (a.s) once said:
"There were two things in this world which softened the Wrath of Allah and prevented its descent upon man: One has been taken away from you; hold the other stead- fastly. The one which has been taken away from men is the Holy Prophet and the one which is still left with them and which they must hold steadfastly is repentance and atonement for sins because Allah at one place in the Holy Book addressed the Holy Prophet and said:
Allah would not punish them while you were among them nor while they were asking for forgiveness. (Surah Anfal, 8 : 33)"
Ref: Nahjul Balagha (Saying # 088)