Qur'ān 43:89 · Az-Zukhruf (الزخرف)

فَٱصْفَحْ عَنْهُمْ وَقُلْ سَلَـٰمٌۭ ۚ فَسَوْفَ يَعْلَمُونَ

So turn aside from them and say, "Peace." But they are going to know.