Comes from the Holy Quran - Sura (chapter)3: Ayat (Verse) 104
وَلْتَكُنْ مِنْكُمْ أُمَّةٌ يَدْعُونَ إِلَى الْخَيْرِ وَيَأْمُرُونَ بِالْمَعْرُوفِ وَيَنْهَوْنَ عَنِ الْمُنْكَرِ ۚ وَأُولَٰئِكَ هُمُ الْمُفْلِحُونَ
"Let there arise out of you a band of people inviting to all that is good enjoining what is right and forbidding what is wrong; they are the ones to attain felicity."