text: See Risala (disambiguation) for other books known as "Ar-Risala".
  The Risāla by  ash-Shafi'i (d. 820), full title Kitab ar-Risāla fī Uṣūl al-Fiqh ( "book of the communication on the foundations of  comprehension (i.e. Islamic jurisprudence)") is a seminal text on the principles of Islamic jurisprudence.