One of the main concerns of Muslim intellectuals in recent centuries has been integration among all Muslims. Amid all types of integration, ideological consolidation based on common principles is considered one of the most fundamental strategies for Muslim unity. In this article, the most important common principles and issues of Islamic schools of thought are examined. According to some Qur’anic verses, the authority of the Qur’an, prophetic traditions, love for those close to the Prophet, and the intellectual authority of the Ahlul Bayt are the most common principles of Islamic brotherhood in all areas and times.