Quran 25:63 from Surah Al-Furqaan on Divine Marvels.
وَعِبَادُ ٱلرَّحۡمَٰنِ ٱلَّذِينَ يَمۡشُونَ عَلَى ٱلۡأَرۡضِ هَوۡنٗا وَإِذَا خَاطَبَهُمُ ٱلۡجَٰهِلُونَ قَالُواْ سَلَٰمٗا
English translation: And (the) slaves (of) the Most Gracious (are) those who walk on the earth (in) humbleness and when address them the ignorant ones they say Peace
Transliteration: wa'ibadu al-rahmani alladhina yamshuna ala al-ardi hawnan wa-idha khatabahumu al-jahiluna qalu salaman