Surah Adh-Dhariyat, ayah 25

51:25

إِذۡ دَخَلُواْ عَلَيۡهِ فَقَالُواْ سَلَٰمٗاۖ قَالَ سَلَٰمٞ قَوۡمٞ مُّنكَرُونَ ٢٥

Idh dakhalū 'alayhi faqālū salāman qāla salāmun qawmum munkarūn

When they entered upon him and said, "[We greet you with] peace." He answered, "[And upon you] peace; [you are] a people unknown."