Quran 51:25 from Surah Adh-Dhaariyat on Divine Marvels.
إِذۡ دَخَلُواْ عَلَيۡهِ فَقَالُواْ سَلَٰمٗاۖ قَالَ سَلَٰمٞ قَوۡمٞ مُّنكَرُونَ
English translation: When they entered upon him and said Peace He said Peace a people unknown
Transliteration: idh dakhalu alayhi faqalu salaman qala salamun qawmun munkaruna