It is narrated from Sayyiduna Habib bin Khirash al-Asari (may Allah be pleased with him) that he heard the Messenger of Allah (peace and blessings be upon him) say: "The Muslims are brothers; no one has any superiority over another except through taqwa (God-consciousness)."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3534