These are eight categories on which zakat is required. As for knowledge, which is like gold, it is required for gold. As for work, which is like silver, it is required for paper. As for the spirit, it is required for sheep. As for the soul, it is required for cows. The raptors must have what is required of camels, and as for what the mind produces of knowledge and grows of secrets, it must include what is required of wheat, and as for what the soul produces of desires and thoughts and grows from imports, it must include what is required of dates, and as for what the raptors produce of deeds and grow from forms of obedience and other things, they must. It contains what is required in barley