By the noble Shaykh Saalih al Fawzaan al-Fawzaan [1]

[Q]:       There are some people here, who keep away from [attending] lessons on ‘aqeedah (creed/beliefs), and they say: “We are Muslims, we are not unbelievers or idol-worshippers such that we have to learn ‘aqeedah or attend lectures about it.”  So, O noble Shaykh, what is your view regarding this?

  By the esteemed Scholar Shaykh Saalih ibn Fawzaan al-Fawzaan [1]

The kalimah (word) Laa ilahah ilallaah (that none has the right to be worshipped except Allaah), if it said with truthfulness and sincerity from the heart, and acted upon in that which it necessitates - outwardly and inwardly - then its effect will indeed be praiseworthy upon both the individual and the society.

From the most important of its effects are:

  Allah - the Most High - says.

"That He will call you to account for what your hearts have earned."

[Soorah al-Baqarah 2:225].

"The day when neither wealth nor children will be of any avail, except he who comes to Allah with a dean and pure heart."

[Soorah ash-Shu'araa 79:88-89].

    مقدمة في الايمان بالله

 المؤلف: العلامة صالح بن فوزان الفوزان

الباب: الايمان بالله

المرجع: الإرشاد إلى صحيح الاعتقاد: ص 27

وهو أساس العقيدة وأصلها ، وهو يعني الاعتقاد الجازم بأن الله رب كل شيء ومليكه ، وأنه الخالق وحده ، المدبر للكون كله ، وأنه هو الذي يستحق العبادة وحده لا شريك له ، وأن كل معبود سواه فهو باطل وعبادته باطلة ، قال تعالى