Nahj al-Balāgha

Hadith 1662
fear-of-godrepentance
٣٠. وَقَالَ (عليه ‏السلام): الْحَذَرَ! الْحَذَرَ! فَوَاللهِ لَقَدْ سَتَرَ، حتَّى كَأَنَّهُ قَدْ غَفَرَ.
30. Amīr al-mu’minīn, peace be upon him, said: Fear! Fear! By Allāh, He has hidden your sins so much so as though He has forgiven.
Source: al-Sharīf al-Raḍī