إذا صُنِعَ إلَيكَ مَعروفٌ فَاذكُرْ، إذا صَنَعتَ مَعروفا فَانْسَهُ
Imam Ali (as):
If an act of courtesy is done unto you, then be sure to remember it, and if you do an act of courtesy unto someone else, then be sure to forget it.
Source:
Ghurar al-Ḥikam
Vol1
P281
ID: 1186