25. Al-Furqan (The Criterion, The Standard)

Surah: 25   Aya: 63

63. WaAAibadu alrrahmani allatheena yamshoona AAala al-ardi hawnan wa-itha khatabahumu aljahiloona qaloo salaman
  

  Translation

63. And the slaves of the Most Beneficent (Allâh) are those who walk on the earth in humility and sedateness, and when the foolish address them (with bad words) they reply back with mild words of gentleness.