Are there books that deal with the order of forbidden things, and if a man is compelled and finds nothing but carrion or pork, which of them should he choose?

The one in dire necessity prioritizes carrion over pork if both are available, because the prohibition of carrion is temporary, while the prohibition of pork is inherent. Scholars have mentioned the order of forbidden things from the most severe to the least: disbelief and polytheism, then minor polytheism, then innovations (bid'ah), then major sins, then minor sins. A hadith (definition) states that a dirham of usury that a man consumes knowingly is worse than thirty-six acts of fornication. This is explained by the fact that usury can lead its perpetrator to an evil end.