Quran Adh-Dhariyat 51:25

إِذۡ دَخَلُواْ عَلَيۡهِ فَقَالُواْ سَلَٰمٗاۖ قَالَ سَلَٰمٞ قَوۡمٞ مُّنكَرُونَ

Translation

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