'Purpose' in the Bible

The fat of an animal that dies naturally or is mauled by wild beasts may be used for any purpose, but you must not eat it.

The dead body of any of these, falling on anything, will make that thing unclean; if it is any vessel of wood, or clothing, or skin, or bag, whatever it is, if it is used for any purpose, it will have to be put into water, and will be unclean till evening; after that it will be clean.

The priest is to examine the contagion on the seventh day. If the infection has spread on the clothing, in the woven material, the knitted material, or in the leather, no matter the purpose for which the leather material had been manufactured, the contagion is a chronic fungal infection. It's unclean.