Ilaah, Rabb, Deen na ’Ibadah ni maneno manne ya msingi katika mafundisho yote ya Qur'ani. Katika kurasa zake zote, Qur'ani inasisitiza mara kwa mara kwamba Allah Mtukufu ndiye Rabb na Ilaah; kwamba hakuna ilaah isipokuwa Yeye, wala hakuna rabb mwingine, wala Yeye hashiriki na yeyote sifa na sifa za kimungu zinazodokezwa na maneno haya. Kwa hiyo Yeye peke yake ndiye anayepaswa kukubaliwa kuwa Ilaah na Rabb wa mtu, wala asiaminiwe hata kidogo mtu mwingine yeyote kuwa na sifa ambazo maneno haya yanamaanisha. Pia inatudai tutoe ’ibadah yetu kwake Yeye peke yake, wala si kwa mwingine yeyote, na tufanye deen yetu kuwa ya Yeye peke yake, na tukatae deen nyingine zote!

Ilaah, Rabb, Deen and ’Ibadah, are four terms basic to the whole teaching of the Qur'ān. Throughout its pages, it stresses again and again that Allah Almighty is the Rabb and the Ilaah; that there is no ilaah but He, nor is there any other rabb, nor does He share with anyone else the qualities and attributes implied by these terms. He, and He alone should therefore be accepted as one’s Ilaah and Rabb, and no one else should in the least be believed to possess the attributes which these words imply. It also demands that we should give our ibadah to Him and Him alone, and not to anyone else, and make our deen exclusive to Him and reject all other deens!

Aya zilizonukuliwa hapo juu ni mifano tu, wala si zile pekee za aina yake. Yeyote anayeisoma Qur'ani kwa kina zaidi ya juu juu atatambua hivi karibuni kwamba maudhui yake yote yanazunguka maneno haya manne tu, na kwamba wazo kuu la kitabu chote ni hili: Allah ndiye Rabb, na ndiye Ilaah; hakuna mwingine mwenye sifa na sifa bainifu zinazodokezwa na maneno haya; kwa hiyo watu wampwekeshe Yeye peke yake kwa 'ibadah, na dini ya mtu iwe kwa ajili Yake pekee, bila sehemu yoyote kwa mwingine.

The verses quoted above are just by way of example, and not the only ones of their kind. Whosoever makes more than a cursory study of the Qur'ān will soon realise that the entire contents revolve round these four terms only, and that the central idea of the whole book is that: Allah is the Rabb, and the Ilaah; No one else possesses the qualities and attributes implied by these terms; Wherefore men should give their ’ibadah to Him and Him alone; and one’s deen should be exclusively for Him with no share of it for any other.