Do good and forbid evil (Surat 'Āli `Imrān 3:110)

كُنتُمْ خَيْرَ أُمَّةٍ أُخْرِجَتْ لِلنَّاسِ تَأْمُرُونَ بِالْمَعْرُوفِ وَتَنْهَوْنَ عَنِ الْمُنكَرِ وَتُؤْمِنُونَ بِاللَّهِ ۗ وَلَوْ آمَنَ أَهْلُ الْكِتَابِ لَكَانَ خَيْرًا لَّهُم ۚ مِّنْهُمُ الْمُؤْمِنُونَ وَأَكْثَرُهُمُ الْفَاسِقُونَ
Kuntum khayra ommatin okhrijat linnasita/muroona bilmaAAroofi watanhawna AAani almunkariwatu/minoona billahi walaw amana ahlu alkitabilakana khayran lahum minhumu almu/minoona waaktharuhumualfasiqoon

You are the best nation produced [as an example] for mankind. You enjoin what is right and forbid what is wrong and believe in Allah . If only the People of the Scripture had believed, it would have been better for them. Among them are believers, but most of them are defiantly disobedient.

Enjoining good and forbidding wrong, (Arabic: al-amr bi 'l-maʿruf wa 'n-nahy ʿan al-munkar)