in 960" CE. What was enforced According to the well known exegete Al-Tabari (d.923) "right" refers to all that God and His Prophet have commanded, "wrong" to all that they have forbidden, i.e. the sharia. Al-Nawawi also stated that Shariah principles determined what was to be commanded and forbidden. However, the verses are vague and do not speak of Sharia/God's law. According to Michael Cook, "a trend" in early exegesis (tafsir) indicated the duty referred to affirming the basic message of Islam—and so commanded only the "unity of God" and "veracity" of his prophet, and forbade polytheism and denial of Muhammad's prophethood. There are also scholarly disagreements between schools of fiqh (madhhab). Types of wrongdoing Al-Ghazali provides "a survey" of wrongs commonly found in the mosque, the market, the street, the bath-house and hospitality". For example in "hospitality" there may be, "laying out silk coverings for men, using censers made of silver or gold, hanging curtains with images on them [images of sentient beings are forbidden among some branches of Islam] and listening to musical instruments or singing-girls. Then there is the scandal of women gathering on roofs to watch men when there are youths among them who could give rise to temptation. Or forbidden food may be served or the house may be one occupied illegally, or someone present may be drinking wine or wearing silk or a golden signet ring, or a heretic may be holding forth about his heresy, or some joker may be regaling the party with ribald and untruthful humour. (Humour that is neither untruthful nor indecorous is acceptable in moderation, provided it does not become a habit.) On top of all this there may be extravagance and wastefulness." Common wrongdoing described by Al-Ghazali committed (for example in the marketplace) may be divided into categories such as commercial dishonesty (e.g. passing off used goods as new, concealing defects in goods), transactions that violate Islamic law (e.g. allowing the customer to pay over time but charging interest), and selling goods forbidden by Islamic law (musical instruments, wine). On the other hand, looking at the violations (found not just in the marketplace) through modern eyes, they can be categorized into a different set of norms being violated: Narrow "religious norms", such as "sloppy prayer, faulty recitation of the Quran". These were relatively rare, based on the fact that they were seldom mentioned in sources available to determine