Ibadah ta farko, kuma gaba ɗaya, ta kasu kashi biyu: wajibi da mustahabbi. Tattaunawar da ke ƙunshe da ƙa'idojin wannan nau'in ibada an takaita ta zuwa rukunai huɗu, wato sassa huɗu. Sashe na Ɗaya yana magana ne a kan fahimtar wajibcin sallah da al'amuran da ke da alaƙa da shi. Sashe na Biyu yana magana ne a kan fahimtar sharuɗɗanta guda uku: sharadin wajibi, sharadin ingancinta, da sharadin cikarta. Sashe na Uku yana ƙunshe da fahimtar ayyukanta da maganganunta, kuma waɗannan su ne ginshiƙanta (arkan). Sashe na Huɗu yana magana ne a kan jinkirta yin sallah da fahimtar hanyoyin gyara bayan rashin cikakkiyar sallah, domin jinkirta aikin da ba za a ɗauka ya wuce ba idan an yi shi yadda ya kamata.

Prayer is divided initially, and as a whole, into two kinds: obligatory and recommended. The discussion covering the principles of this form of worship is confined to four categories, that is, four parts. Part One is about the identification of the obligation and matters related to it. Part Two is about the identification of its three conditions: the condition of obligation, condition of validity, and the condition of completion. Part Three covers the identification of its acts and words, and these are its essential elements (arkan). Part Four is about its delayed performance and the identification of forms of rectification following irregularity, for it is the delayed performance of an act that would not be deemed as lapsed had it been duly performed.