This is the Kaji Nur Besi which very much famous in Malay-Aceh and Sumatera . The most famous from ancient time and was used by the commanders of war, fleet commanders (admirals) and the masters of swordsmanship.

Known that iron has two types, the male Iron and the female Iron. The male iron is called as Nur besi lah putih (white light of iron); the female iron is called as Nur besi lah hijau (green light of iron). With this knowledge/ science someone could be immune or in other words will invulnerable/ immune by any bladed weapon kinds which was made from metal.

The male iron (white light of iron) exist in a human body, located from the root of nose as far as the backbone of genital, and the female Iron (green light of iron) is exist in nature like: the chopping knife, the machete, the sword, glasses, various type of wood in nature around us.

It was understood that the male iron and this female iron are the couple like a couple of husband and wife. The male iron must give the livelihood (living) to female. The livelihood which is given is the inah heaven's flowers. Because of the lack of human knowledge to this essence then the male iron never gives the livelihood (living) to the female iron which made the female iron angry and demanded to drink and eat. Drink as human blood; eat as human flesh and human bones. So each time sharp female iron touches the human body then there will spill blood and flesh (hurt and injured), bones are the sharpeners.

So to make the body; skin, flesh, bones were not harmed or sliced from iron (female iron) then we as the owner of the body must help to give the livelihood to the female iron in the form of the inah heaven's flowers. For anyone that has already initiated this feeding method (livelihood) to the female iron by a Nur Besi teacher, then insha Allah (with God willing) his body will not be eaten or in other words, can't be harmed or sliced and saved from all sorts of the weapons attack that made from metal.