The Light of the Earth and Skies
Lady Fatima (peace be upon her) is the light of the people of heaven and Mahdi (peace be upon him) is the light of the people of the earth.
It was narrated that Prophet [Muhmmad] (peace be upon him and his progeny) said, “Then the sunrises and sunsets (easts and the wests) were darkened, so the angels complained to God Almighty if He would reveal (eliminate) this darkness from them. And so God spoke a word, which became a soul. He then spoke another word, which became a light. So the light shone on the soul and [God] ascended it (the light and soul) to be of the same status as his throne. After which, the sunrises and sunsets blossomed. [The light and soul] is Fatima Al-Zahra'a (peace be upon her). That is why she was named Al-Zahra'a (the blossom), because with her light, she blossomed the heavens.”
It was narrated that Prophet [Muhmmad] (peace be upon him and his progeny) said, “Then the sunrises and sunsets (easts and the wests) were darkened, so the angels complained to God Almighty if He would reveal (eliminate) this darkness from them. And so God spoke a word, which became a soul. He then spoke another word, which became a light. So the light shone on the soul and [God] ascended it (the light and soul) to be of the same status as his throne. After which, the sunrises and sunsets blossomed. [The light and soul] is Fatima Al-Zahra'a (peace be upon her). That is why she was named Al-Zahra'a (the blossom), because with her light, she blossomed the heavens.”
Al-Mufadhal bin Omar narrated about Imam Al-Sadiq that he once said, “When our Qa’im (the ever-standing, Imam Al-Mahdi) rises, the earth will shine with the light of its Lord, and the worshippers will no longer need sunlight and the darkness will be gone.”