The Qur'an gives clear instructions on many issues, such as how to perform the ritual purification (') before the obligatory daily prayers ('), but on other issues, some Muslims believe the Qur'an alone is not enough to make things clear. For example, the Qur'an states one needs to engage in daily prayers (') and fast (') during the month of Ramadan but Muslims believe they need further instructions on how to perform these duties. Details about these issues can be found in the traditions of Muhammad, so Qur'an and Sunnah are in most cases the basis for ("").