Thus, he endures smelting in crucibles 1 , heating over fire, and striking with hammers.
And therein is what [the soul] endures in the fire of the furnace 2 , such as lime 3 and gypsum 4 , and the hearths, the crucibles, the pipes, the copper, and being cut by saws, and burns until it becomes charcoal—once in wood and once in reeds—and all types of torment while it remains motionless. This is among the types of metamorphosed forms (al-Masukhiyyat), the most severe in punishment and the greatest in affliction. We seek refuge in God that He may keep us far from it and from all that we have mentioned of the metamorphosed forms and their types, including those that are transferred into the plants of the earth, the herbs, the legumes, and the trees. As for the fruits of the trees, most of them are the elements ('Anasir) of the believers—those that are pleasant, sweet, delicious, and found good by the believers 5 .
[5] As it was narrated on the authority of the Lord al-Sadiq—exalted is His might—that he said: "Verily, grapes are from the returns of the pupils of the eyes 6 , sugarcane is from the returns of the shins, and cucumbers are from the returns of the forearms."