Jabir ibn Hayyan (Father of Chemistry) asked Imam Ja'far Sadiq: "O Master, O son of the Prophet, tell me what is death?" The Imam said: Can Jabir understand? Jabir said, "O my lord, if you think you are qualified, explain." The Imam said, "Listen carefully and understand. When you were in your mother's womb, you lived in the dark curtains. I didn't see the vastness and the light, but you didn't want to go to that dark place where I was so happy, because you didn't see a place bigger than that, that's why you cried when you came to this place. It started because you thought I was dying, but the people here were happy that I was being born in this place. This is what will happen when you leave this place and go to the next place. What is happening is that the people here will be crying that the oppressor is dying. The Imam said: What the oppressor calls birth is actually death and what the world calls death is in fact birth. There is the same difference between this world and the next world, just as the oppressor does not want to come back to this world, so he will not want to return to the previous world after seeing the vastness of the next world. Remember, the difference between the mother's womb and this world is as great as the difference between this world and the next world, and the same difference between this world and heaven;