  His philosophical book was written in Arabic and entitled al-‘Aqîdah al-rafî‘ah (The Exalted Faith). The Arabic original is no longer extant. Towards the end of the fourteenth century, the work was translated into Hebrew twice: the first time under the title Ha-Emunah ha-Ramah by Solomon ben Lavi (c. 1370?), possibly at the instigation of the philosopher Hasdai Crescas, and a second time under the title Ha-Emunah Nissa’ah by Samuel ibn Motot. This second translation is based on the first, but is less accurate (Eran 1996). Of this version only one copy is extant, whereas of Ha-Emunah ha-Ramah 16 manuscripts are known (some of them are not complete). 