In Islamic theological writings, under the heading of sustenance, the focus is generally on issues such as who is the provider of sustenance, whether haram is considered sustenance, and whether Allah’s consent exists for haram sustenance. Another issue that can be found between the lines of the subject of sustenance is whether it is haram for a person to work for sustenance or not. In fact, the pursuit of means of livelihood in order to sustain one’s life is, according to (...) the general and predominant acceptance of Muslim scholars, permissible and, in cases of necessity, wajib. According to a record in Uṣūl al-niḥal, during the formative period of itizālī thought, there were Mu‘tazilite sufis (ṣūfiyyat al-Muʿtazila) such as Bishr b. al-Mu‘tamir’s disciple Abū Imrān Mūsā b. al-Raqqāshī, al-Naẓẓām’s apostate disciple Fadl al-Hadathī, and Husayn al-Kūfī, about whom no information is available. These names, who seem to have earned their livelihood through almsgiving, defended the forbiddenness (taḥrīm al-makāsib) of all kinds of endeavour for sustenance, contrary to the acceptance of Muslim thinkers. However, it should be noted that for them, the forbiddenness in making an effort for sustenance does not cover the definition of sustenance, which is ‘all the benefits’, but only the effort in obtaining sustenance through means such as trade and agriculture. It is interesting to find such an extreme tendency among the Mu‘tazilites, who came to the fore with their rationalist discourses. “How could a Mu‘tazilite defend tahrīm al-makāsib?”, the issue of abandonment of striving for sustenance (tark al-makāsib), from which the idea of tahrīm al-makāsib is thought to have evolved, is mentioned, and then the Mu‘tazilite sufis views on tahrīm al-makāsib are tried to be based mainly on Mu‘tazilite sources and the criticisms of Mu‘tazilite authors against them are included. It has been determined that Mu‘tazilite sufis justifications for defending tahrīm al-makāsib concentrate on three points: (i) the absence of a just order due to the absence of a just imam and the possibility of supporting the oppressors (rulers) intentionally or unintentionally, and as a result of this, some of them describe the land of Islam as dār al-kufr, (ii) again in relation to the issue of imamate, in an environment where there is no justice, i.e. legal/moral order, the halāl and harām are so intertwined that they cannot be separated from each other, and in order to protect oneself from harām, the things that are subject to sustenance can only be purified through charity and become halāl, and (iii) the fact that trust in Allah is obligatory and any effort to pursue sustenance is contrary to tawakkul. The Mu‘tazilite authors criticised the proponents of tahrīm al-makāsib on the grounds that it is permissible to trade while maintaining a rational and ethical attitude, that one’s intention and interest in trade are important, and that tawakkul cannot be built on the right ground. As a result, the proponents of tahrīm al-makāsib disappeared because they could not gain a foothold in the Mu‘tazilite intellectual climate due to their erroneous reasoning. (shrink)