According to the Imamiyah faith, every sane thinking person has a moral duty to know his Creator. He should believe in His Oneness and Divinity, and should ascribe no partner to Him in His Actions. He should also believe that creation, sustenance, life and death are governed by Him alone. He is the All-pervading, and if somebody ascribes sustenance, creation, or the giving of life and death to anyone else except God, he will be considered an unbeliever (kafir), someone who ascribes partners to God in His work (mushrik) and will be excluded from the Islamic fold.
Similarly, in obedience and worship of God sincerity is necessary. That is, if somebody worships anything else other than God Almighty, or adores someone or something else, or considers worship of something other than Him as a means of nearness to Him, he also, according to the Imamiyah faith, shall be regarded as an unbeliever.
Worship of anyone except God, the One without any partner, is not lawful. Obedience to anybody except God the Almighty, the Holy Prophets, and the Holy Imams is also not permissible.
Obedience to the Prophets and the Imams is indirectly obedience to God, because they are the ones who proclaim of the divine command; but to obey them with the idea that it is worship of God is unlawful and purely a satanic deceit. To seek blessings from these revered persons, to make them a means of intervention between ourselves and God, and also to offer certain prayers at their graves is lawful because this is worship of God and not worship of them. This is quite an obvious difference. According to the holy words of God the Almighty, "in houses which God has permitted to be raised to honour, for the celebration in them of his name", it is lawful to offer prayers to God in these sacred places. This is the faith of "tawhid" of the Imamiyah sect, which is unanimously supported by all our 'ulama'.
The subject of the monotheism has been divided into several types: "tawhid adh-dhat" (the Essence of the One God), "tawhid as-siffat" (the Attributes of the One God), "tawhid al-af'al" (the Actions of the One God). For the sake of brevity we will not dwell on this topic.
