Az Zukhruf, 89 Ayah
43:89
فَٱصۡفَحۡ عَنۡهُمۡ وَقُلۡ سَلَٰمٞۚ فَسَوۡفَ يَعۡلَمُونَ ٨٩
Fāşfaĥ `Anhum Wa Qul Salāmun ۚ Fasawfa Ya`lamūna
So turn aside from them and say, "Peace." But they are going to know.