Divine concealment of sins as a mercy
Nahj al-Balāgha|Volume 1|Book 3|Chapter 30
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.