An-Nawawiyy and other scholars of the four schools (madh-habs), classified apostasy into three categories: apostate beliefs, apostate actions, and apostate sayings. Each category of apostasy is divided into many subdivisions.Scholars from the four schools (madh-habs) classified apostasy into three categories: apostate beliefs in the heart, apostate actions committed by the various body parts, and apostate sayings uttered with the tongue.
The Shaafi^iyy Imaam, an-Nawawiyy, classified apostasy as such in his book, al-Minhaaj, as did the Shaafi^iyy Imaam, Ibn-ul-Wardiyy, in his book, al-Haawi.
Committing blasphemy of any one category, either on its own or in conjunction with blasphemy of another category, takes the person out of Islaam.
It is not a condition that blasphemy of one category be committed in conjunction with blasphemy of another category for that judgement to hold.
1) Examples of the first category of apostasy, i.e., the apostate beliefs, are:
- Having the doubt in Allaah, His Messenger, the Qur’aan, the Day of Judgement, Paradise, Hell, Reward, or Punishment, or having the doubt in similar matters upon which there has been scholarly consensus (Ijmaa^);
The person who doubts in Allaah, even for a moment, becomes a blasphemer.
Doubting in Allaah means one no longer holds the unequivocal conviction that Allaah exists.
The same judgment applies if one doubts whether or not Allaah’s Existence is without a beginning, without an end, or without a place.
By the same token, one should be certain that Allaah is not like the creation in any way, and doubting it is blasphemy.
The one who doubts about the truthfulness of the Message of Prophet MuHammad

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The person who doubts the Qur’aan is a blasphemer.
The one who doubts whether or not the Day of Judgment will occur is a blasphemer.
The one who doubts whether or not the believers will be rewarded in Paradise or the blasphemers will be tortured in Hellfire is a blasphemer.
On the other hand, one needs to differentiate between the doubt that takes the person out of Islaam and the mere involuntary thought that may come to a person whose heart remains firm on the proper belief.
It is not blasphemy if a blasphemous thought merely comes to a person’s mind if it does not make the person doubt in the proper belief.
In the contrary, one is rewarded for hating such a thought and rejecting it.
Ijmaa^ is defined as the scholarly consensus of the mujtahids* on an Islamic matter in any era.
*Mujtahids refer to the top qualified scholars, such as ash-Shaafi^iyy, Maalik, AHmad Ibn Hambal, Abu Hanifah and the like. They are the ones who are qualified to deduce Islamic judgments from the Qur’aan and the Hadeeth. Hence, the agreement of a group of Muslims (whether laymen or non-mujtahid scholars) does not constitute Ijmaa^.
It is blasphemy to doubt the truthfulness of any matter which all Muslims (the scholar and laymen alike) know the Prophet

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An example would be the weighing of the deeds in the Hereafter.
It is known to the Muslim layman and scholar alike that the Prophet

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So, whoever doubts whether or not the deeds are weighed in the Hereafter is judged as a blasphemer, unless he did not know that this is a matter in the Religion because he is a new Muslim (or like a new Muslim).
- Believing the world is eternal by kind and elements or by kind only;
It is blasphemy to believe that something other than Allaah is eternal.
Everything other than Allaah had a beginning to its existence.
Muslim scholars judged as blasphemer the one who believes the world is eternal.
Among them (i.e. scholars that mentioned this judgment):
1. al-Mutawalli (a prominent scholar of the Shaafi^iyy school);
2. Qaadi ^IyaaD (one of the most famous Maalikiyy scholars; d. 544 AH);
3. Ibnu Daqeeqil-^Eed (It was said he attained the level of mujtahid, and was famous in teaching both the Maalikiyy and the Shaafi^iyy schools; d. 702 AH);
4. The famous Haafidh Ibn Hajar al-^Asqalaaniyy; and many others.
- Renouncing one of the attributes of Allaah, ta^aalaa, known by necessity* He is attributed with-such as His Knowing about everything;
There are certain attributes known among the Muslim laymen and scholars alike to be attributes of Allaah, like Life, Power, Knowledge, Will, etc.
To deny Allaah is attributed with any of these attributes is blasphemy.
For example, the one who doubts that Allaah has Power over all things, or doubts that Allaah is attributed with Speech (al-Kalaam), Hearing, or Sight is a blasphemer.
On the other hand, one does not blaspheme if, for example, one never thought about Allaah being attributed with Hearing, provided one does not hold a contrary belief.
- Ascribing to Allaah what is known by necessity does not befit Him-such as being a body;
There are certain attributes which both the knowledgeable Muslim and the layman know Allaah is clear of, i.e., attributes which are non-befitting to Him.
The one who attributes to Allaah any of these attributes is a blasphemer.
For example, the person who says Allaah is a body or has bodily attributes is attributing to Allaah what every Muslim knows does not befit Him.
Similarly blasphemes whoever says Allaah is an illumination, or is attributed with colour, because these claims entail likening Allaah to the creations.
Likewise, the one who says Allaah is a body, but not like other bodies, is a blasphemer.
The author of the famous Hambaliyy book al-KhiSaal related that Imaam AHmad Ibn Hambal judged as a blasphemer the person who says, “Allaah is a body, not like other bodies.”
The one who says, “Allaah is a body” is attributing to Allaah a non-befitting attribute and his qualifying phrase, “not like other bodies,” does not clear him of having committed blasphemy.
A body by definition is something which has a format and a shape and takes up space.
All these are attributes of the creation, and are not befitting to ascribe to the Creator.
*Issues which are known by necessity are the issues that are known to the laymen and the scholars alike, without any need of deduction.