Arabic texts dating from the 3rd-4th/9th-10th centuries by the following five authors are here presented: Abū Shaykh al-Burjulānī, Ibrāhīm al-Khuttalī, Ibn al-Naḥḥās, Abū ʿAbd Allāh al-Rūdhabārī and Ibn Ḥamakān. The texts appear in transliteration along with a German translation. Their chains of transmission (isnāds) are analyzed and parallels with other authors are noted. The subject dealt with throughout is mystical piety. These highly interesting materials throw light on Islamic mysticism's early stage of development.