Adh-Dhariyat - 51:25

إِذْ دَخَلُوا عَلَيْهِ فَقَالُوا سَلَامًا قَالَ سَلَامٌ قَوْمٌ مُّنكَرُونَ
[51:25]
When they entered upon him, they said: Peace. Peace, said he, a strange people.
Behold, they entered his presence, and said: "Peace!" He said, "Peace!" (and thought, "These seem) unusual people."
When they came in unto him and said: Peace! he answered, Peace! (and thought): Folk unknown (to me).