Imam Rida (peace be upon him): Abdullah ibn Jundab said: I wrote to Imam Rida (peace be upon him) asking him to explain for me the tafsir of the verse: اللهُ نُورُ السَّماواتِ وَ الْأَرْضِ [Allah is the light of the heavens and the earth]… Imam Rida (peace be upon him) wrote to me in reply: "To proceed: Muhammad (peace be upon him and his family) was the trustee of Allah among the people. When the Prophet passed away, we, the Ahl al-Bayt, are his heirs, so we are now the trustees of the Lord upon the earth. The knowledge of manaya (deaths) and balaya (calamities) and the genealogies of the Arabs is with us, and we know which persons were born upon the fitrah of Islam, and we know the reality of every person's faith. Whenever we see a man, we see the reality of iman (faith) and nifaq (hypocrisy) in his face. Our Shia and their fathers are written down by name and mark in a special book. Allah has taken a covenant from us and from them; they will enter with us in the same place and dwell with us. We and the Shia are the true and real Muslims, and until the Day of Judgement the true Muslims are we and our Shia. We cling to the firm rope of the Prophet (peace be upon him and his family), and the Prophet clings to the firm rope of Allah, and our Shia too will cling to our rope. Whoever separates from us perishes, and whoever follows us is saved. Those who separate from us and deny our wilayah (guardianship) are disbelievers, and whoever follows us or follows our followers is a believer. A disbeliever does not love us, and a believer does not show enmity to us. Whoever dies loving us, Allah will resurrect him with us. We are a light for our followers by which they find their way and are guided. Whoever wishes to be guided is guided through us. Whoever is not with us will not be a Muslim. Allah opened the religion through us and through us He will seal it. Through us Allah has fed you from the food and provisions of the world, and through us He has sent down rain from the sky. Allah the Exalted, for our sake, has protected you from drowning in the sea and from being swallowed up in the earth, and through us Allah benefits you in the world and in the grave, in the gathering (mahshar), on the sirat, at the mizan, and at the time of your entering paradise. Our likeness in the Book of Allah is like the mishkah (niche) which is in a lantern. We are the mishkah, and the misbah (lamp) is Muhammad, the Messenger of Allah, which shines within the glass like a brilliant star. یَکادُ زَیْتُها یُضِیءُ وَ لَوْ لَمْ تَمْسَسْهُ نارٌ الْقُرْآنُ نُورٌ عَلی نُورٍ إِمَامٌ بَعْدَ إِمَامٍ یَهْدِی اللهُ لِنُورِهِ مَنْ یَشاءُ وَ یَضْرِبُ اللهُ الْأَمْثالَ لِلنَّاسِ وَ اللهُ بِکُلِّ شَیْءٍ عَلِیمٌ [The oil almost gives light even though fire has not touched it — the Qur'an — light upon light — one Imam after another — Allah guides to His light whomever He wills, and Allah sets forth parables for the people, and Allah is Knower of all things]. The Qur'an is a light upon a light, and Allah with the light of His guidance guides whomever He wills. The Lord sets forth parables for the people and He has power over everything. So the light is Ali (peace be upon him), and Allah guides to our wilayah whomever He wills, and it is upon Allah to raise our friend with a luminous face and to show him His proof. He will be a companion of those upon whom Allah has completed His favour, from among the prophets, the truthful, the martyrs and the righteous, and how excellent are they as companions! (Nisa: 69) Allah places our friends among the pious and counts them in the ranks of the truthful, the martyrs and the righteous. Our martyrs have precedence over the rest of the martyrs, and the martyrs of our Shia likewise have precedence over the rest of the martyrs. We are the chosen ones and the children of the prophets, and in His Book Allah has introduced us as infallible, and we are more entitled to the Messenger of Allah than all the people. And we are those for whom Allah has legislated His religion, and in His Book He has said: 'He has laid down for you the religion which He enjoined upon Nuh, and that which We have revealed to you, and that which We enjoined upon Ibrahim, Musa and Isa.' (Shura: 13) We took hold of the sharia and delivered what we took hold of. The sciences of the prophets (peace be upon them) Allah deposited with us. We are the heirs of the prophets and the heirs of the possessors of knowledge and the Ulul Azm (of firm resolve) prophets (peace be upon them). So now, establish the religion as Allah has commanded: do not scatter apart from one another. It is very hard upon the polytheists that you invite them to the wilayah of Ali (peace be upon him). O Muhammad (peace be upon him and his family), Allah guides those who respond to you concerning the wilayah of Ali (peace be upon him). O Muhammad (peace be upon him and his family), I have sent down a Book for you; ponder over that Book and reflect upon it, for in it is healing and light."