A Step-by-step instructional guide to learn how to pray In Islam . As-Salah is one of the fundamental pillars of Islam. 1) As-Salah is the 2 nd pillar of Islam. 2) It is the first priority after belief in the Oneness of Allah and in the Prophethood of Muhammad ( ¿ ). 3) It is such an important pillar, that Muslims are called upon to perform this act of worship in all circumstances without fail. Abandoning it is disbelief.