Abstract
It cannot be mentioned that Islamic sciences were divided in such a clear way and that they were separated from each other with thick lines in Age of Bliss (Early Muslim Society) and the following several centuries. For this reason, it is seen that early Muslim scholars generally studied all of these sciences and compiled works in different fields. In later periods the basic provisions of Islamic Religion have generally been evaluated in three groups; faith, deeds and morals. Among the Islamic sciences, the subjects of faith have been the fields of Aqa'id and Kalam, whereas the practical subjects; of the fields of Fiqh, and the morals; in the field of Sufism. However, with the classification of sciences, scientists, in each branch of science, began to come forward. Therewithal, in the periods when sciences were started to be reviewed in different categories, it was seen that some scholars still gave works in different branches of Islamic sciences, and some of them; in the field that they were steeped themselves in more. It is understood from his work named "al-Emedü'l-Aqsâ", which he wrote in this field, that a Hanafi jurist (faqih), Debûsî, (d. 430/1039) also has deep knowledge on sufism/morality by coming to the fore in the field of branches fiqh and usul al-fiqh. He has presented the mystical subjects he deals with in this work, in a way that does not fall short of those of Sufi authors, and explains in detail the deeds that will lead a person to success/salvation or torment. Debûsî also includes many verses and hadiths on the subject in his explanations about the subjects he deals with. Another point that draws attention is that, in this work of Debûsî, some narrations, that includes doubts about whether they belong to Prophet or not and are considered weak and even make-up, are directly attributed to Hadrat Prophet, and this is a common case in some sufi sources. Despite some issues that may be subject to criticism in this way, Debûsî's work named al-Emedü'l-aqsâ, in which he deals with the subjects of Sufism in general, is an important source worth considering and benefiting from in many aspects. Likewise, this work is remarkable in that it reveals the mystical aspect of Debûsî, who is generally known for his jurisprudence.