(Addariyath) 51 : 25
إِذْ دَخَلُوا عَلَيْهِ فَقَالُوا سَلَامًا ۖ قَالَ سَلَامٌ قَوْمٌ مُنْكَرُونَ
When they entered to him, then they said: Peace! He said: Peace, a people of strange.
See explanation 15: 52.