All Praise is due to Allah, the Lord of the Worlds, the final outcome is for the pious, and may Allah’s Peace and Blessings be upon Muhammad, and upon all of his family and his Companions.
When I arrived at Aamol (is a famous city in Tabaristaan) in Tabaristaan and Jailaan, whilst intending to visit the Sacred House of Allah and to visit the grave of His prophet Muhammad (sallallahu alayhi was sallam) and his noble Companions – my brothers in Islam asked me to compile for them parts from the fundamentals of the Religion, which was adhered to by those who preceded – from the Imams of the Religion, the scholars of the Muslims, and the Pious Predecessors. Those who guided and called the people towards it at all times, prohibited [them] from what opposed all that which contradicted the body of the truthful pious believers; who assisted in its adherence, showed hostility [toward those who went against] it. They heresized and apostated those who believed in other than this [creed]. They obtained for themselves and for those who they called towards it – its blessing, its sanctity and its goodness. They attained the reward of their creed for what they put forward for it, for their adherence to it, for guiding the worshippers towards it, and their bearing of it.
So, I sought Allah’s guidance and put down in writing in this section a little from it for abridgement, hoping that it benefits those of intelligence and insight. Allah (SWT) actualizes the hope and abundantly bestows upon us blessings with success, and uprightness upon the path of the right-course and the truth, with His blessings and His kindness.