The decrees of the religion of Islam are divided into four.
a) Belief (Decrees related to creed): They are the decrees that are related to the issues that man needs to accept and refuse in the religion of Islam. These decrees teach man what he needs to accept and refuse. By believing in the principles of belief, man takes his spiritual food, purifies his heart of wrong beliefs and gains his real value.
b) Deeds: Deeds are the actions that man performs. They are the actions that need to be done or not to be done. The decrees that explain what deeds should be done under what conditions and how deeds become valid are called practical deeds; for instance, to pray, to pay zakah (alms), to make jihad, to learn knowledge.
c) Ethics: They are decrees that explain states and actions, attitudes and Islamic and human relations. They are decrees that are related to beautifying ethics and educating conscience; for instance, not cursing or telling lies, wanting things that one wants for himself also for others.
d) Law [Muamalat (Transactions), Uqubat (Penalties)]: They are the decrees that are outside the issues like belief, ethics and private deeds and that are related to governing the state, ruling the community, economic issues, marriage, divorce, inheritance, commercial and political affairs; in short, they are all of the decrees that determine the laws and rules of the Islamic state.
Islam is not an indispensible part of human life but the whole of it with all aspects. Islam encompasses and determines man’s twenty-four hours and all of the issues from birth to death. Islam is the whole of man’s life. It is a whole with its belief, worship and law. It cannot be divided or synthesized with something else. It does not accept removal and addition, and superstitions. It is a perfect system completed by Allah.