Al-Mufeed Talks About a Group of Soofees

و الحلاجية ضرب من أصحاب التصوف و هم أصحاب الإباحة و القول بالحلول و لم يكن الحلاج يتخصص بإظهار التشيع و إن كان ظاهر أمره التصوف و هم قوم ملحدة و زنادقة يموهون بمظاهرة كل فرقة بدينهم و يدعون للحلاج الأباطيل و يجرون في ذلك مجرى المجوس في دعواهم لزرادشت‏ المعجزات و مجرى النصارى في دعواهم لرهبانهم الآيات و البينات و المجوس و النصارى أقرب إلى العمل بالعبادات منهم و هم أبعد من الشرائع و العمل بها من النصارى و المجوس

And the Hallaajiyyah, are a group from the Soofees, and they are the people of disclosure (?) (ibaaHah) and they say about embodiment (incarnation) (al-hulool)*. And it was that they Al-Hallaajiyyah outwardly claimed to be a Shee`ah, but (instead) had apparent actions of the Soofees. And they are apostates and irreligious people, disguising apparently to every sect of their religion, and calling to false (powers) of Al-Hallaaj, and (like) that of the majoos (fire-worshippers) who used to call to Zoroaster, and the Christians who called to their monks the clear ayah (signs). Yet, majoos (fire-worshippers) and Christians are nearer to their worship rituals than they are, and, they (the Hallaaj) are further from the share`ah and actions than the Christians and Majoos.

Source:

1.       Al-Mufeed, taSaHeeH Al-`Itiqaad, pg. 131 (First Edition, published on 1413 in Qum, Iran)

*Al-Hulool - is the belief that it is possible and permissible for Allaah (سبحانه و تعالى) to become incarnated in man’s body.