"And hold fast, all of you together, to the rope of Allah, and be not divided among yourselves."[312] Muslim unity has two fundamentals, one of which is to uphold the Holy Qur'an as the constitution of life, and the second of which is to accept our mutual responsibility towards each other as Muslims, for the Messenger of Allah (PBUH & HF) has said: "Whoever does not care about the affairs of the Muslims is not one of them," and, "Whoever hears a man calling 'O Muslims!' and does not respond is not a Muslim."