The Jahmiyya are the followers of Jahm ibn Safwan Abu Muhriz
al-Rasibi al-Samarqandi or al-Khazari or al-Tirmidhi (d. 128). Bukhari narrated in the
first chapter of his "Khalq Af`al al-`Ibad" that Jahm once came
out of his house saying: "Allah is the wind and everything else." Ibn Hajar in
the introduction of "Fath al-Bari" defined his sect as:
"Those who deny Allah’s attributes which the Book and the Sunna affirm,
and who say that the Qur’an is created." Ibn Kathir states that
Jahm’s teacher in Kufa was al-Ja`d ibn Dirham, who was the first to say that the Qur’an
was created, and that Jahm’s student was Bishr al-Marisi: "To him [Jahm] are
ascribed the Jahmis, who claim that Allah is in every place in His Essence."
Ibn `Asakir and others traced the genealogy of Jahm’s doctrine thus: Jahm ibn Safwan
< Ja`d ibn Dirham < Bayan ibn Sam`an < Talut - the nephew and son-in-law of Labid
ibn A`sam, who once cast a spell on the Prophet (saw). 
Al-Ash`ari described them as follows:
The Jahmiyya claimed that disbelief in Allah (al-kufr billah)
is but ignorance of Allah. This doctrine is attributed to Jahm ibn Safwan. The Jahmiyya
claimed that if a person receives knowledge, then disavows it with his tongue, he does not
commit disbelief with such a disavowal. They claim that belief (eeman) is
indivisible and that its subscribers are all in one-and-the-same category. They claim that
belief and disbelief can only be in the heart at the exclusion of any other member of the
body ... What Jahm alone said is that Paradise and the Fire shall pass away and become
extinct; that belief is only knowledge of Allah and nothing else; that disbelief is but
ignorance of Allah and nothing else; that no act is anyone’s doing in reality, other
than Allah’s alone, and that it is His doing. [This is the core of the belief of the Jabriyya]
... Jahm used to profess the ordering of good and the forbidding of indecency ... He used
to say that Allah’s knowledge is brought to be (muhdath). This is what they
related from him. He also used to say that the Qur’an is created and that it
must not be said that Allah has always been cognizant of things before they take place.
[This is also what the Qadariyya and Mu`tazila professed.] 
The Jahmiyya were considered to be disbelievers, and it is
related that al-Bukhari said: "I hold as ignorant whoever does not declare the Jahmiyya
to be disbelievers." This was also the Hanbali position as shown in many
places of Ibn Abi Ya`la’s "Tabaqat al-Hanabila" and the books
of `Abd Allah ibn Ahmad ibn Hanbal, Abu Bakr al-Khallal, and `Uthman Abu Sa`id al-Darimi.
Ibn Abi Ya`la relates from the Hanbali Abu Muhammad al-Barbahari:
1. Some of the scholars, among them Ahmad ibn Hanbal, said that the Jahmi
is a disbeliever (al-Jahmee kafir), he is not of the People of the Qibla,
and his blood is licit to shed. He neither inherits nor is inherited-from. This is because
they say that there is no jum`a prayer, nor congregational (jama`a) prayer,
nor `Eid prayer; they say that whoever does not say that the Qur’an is
created is a disbeliever; they consider licit the use of the sword against the Community
of the Prophet (saw); they contravene all those who came before them; they
investigate people with something which the Prophet (saw) never said, nor any of
his Companions (ra); they try to close down mosques, humiliate Islam, and
get rid of jihad; they strive toward disunity; they contradict the narrations of
the Prophet (saw) and the Companions (ra); they speak on the basis of
abrogated (mansukh) texts; they use ambiguous (mutashabih) texts as
proofs; they instill doubt in the people concerning their Religion; they argue concerning
their Lord [i.e., they deny His Attributes]; they say that there is no punishment in the
grave, nor Basin (hawd), nor intercession, and that neither Paradise nor the Fire
are yet created; and they deny much of what the Prophet (saw) said. 
 Ibn Kathir, "al-Bidaya wa al-Nihaya"
 Al-Ash`ari, "Maqalat al-Islamiyyin wa Ikhtilaf al-Musallin"
("The Discourses of the Proponents of Islam and the Differences Among the
Worshippers") (1:214, 338).
 Abu Muhammad al-Barbahari, "Sharh Kitab al-Sunna," in Ibn Abi
Ya`la’s "Tabaqat al-Hanabila" (2:30).
© Copyright As-Sunna Foundation of America. All rights reserved.