إن عَيَّرَكَ أخوكَ المُسلِمُ بِما يَعلَمُ فيكَ فَلا تُعَيِّرْهُ بِما تَعلَمُ فيهِ؛ يَكونُ لَكَ أجرا وعَلَيهِ إثما.
The Prophet Muhammad (S):
If your Muslim brother condemns you for whatever he knows about you, then do not condemn him back for whatever you know about him. You will have a reward whereas he will carry a sin.
Source:
Mizan al-Hikmah
Vol1
P922
Tanbyh alkhawatir w nuzhat alnawazir
Vol2
P155
ID: 16133