The Imams عليه السلام are the light of Allah, the Most Holy, the Most High

2. Ali ibn Ibrahim has narrated through his chain of narrators from abu ‘Abdallah عليه السلام about the words of Allah that say, There are those who follow the Messengers, the illiterate Prophet (not conventionally educated), whose description they find written in the Torah and the Gospel. [He (the Messengers) enjoins them to do good and forbids them to do all that is unlawful, makes lawful for them all that is pure and unlawful all that is filthy, removes their burdens and the entanglements in which they are involved]. Those who believe in him, honor and help him, and follow the light which is sent down to him, will have everlasting happiness.” (7:157) The Imams عليه السلام said, “It is Amir al-Mu’minin Ali عليه السلام and the Imams عليه السلام after him who are called ‘light’ in the above verse of the Holy Quran.”