Before the popularization of the Latin alphabet (Qubee) for Oromo in the 1990s, the language was largely an oral tradition in religious circles. Sheikh Muhammad Rashid Bilal utilized the Arabic script (Ajami) to write in Afaan Oromo, bridging the gap between the classical Arabic texts and the local population. His work on Kitaaba Usuula was pioneering because it proved that complex Islamic theology could be articulated with precision and beauty in the Oromo language.
If you are looking for broader Islamic educational resources in Afaan Oromoo, these titles are often found alongside "Usuula": Kitabu Tawhid : Foundations of monotheism. Aqiidaa Islaamaa : Lessons on Islamic creed and belief. Hadiisa Arba'iina kitaaba usuula pdf
or "The Three Fundamentals") is available through several digital platforms in Afaan Oromoo and other languages. Available PDF Versions Usuulu Assalaasaa (Afaan Oromoo/Amharic) : You can find a comprehensive 90-page document of Usuulu Assalaasaa on Scribd Before the popularization of the Latin alphabet (Qubee)
Kitaaba kana keessatti matadureewwan guguddoo armaan gadiitu dhiyaata: If you are looking for broader Islamic educational
Usuula Al-Thalaatha jechuun "Hunda-deephota sadi" jechuudha. Kitaabni kun gaaffilee sadii kan namni hundi qabrii keessatti gaafatamu irratti xiyyeeffata. Isaanis: Rabbii kee eenyu? (Gooftaa kee beekuu) Diiniin kee maali? (Amantii kee beekuu) Nabiyyiin kee eenyu? (Nabiyyii kee beekuu)
Akkaataa kadhannaan, sodaan, kajeellaan fi abdiin itti qulqulleeffamu.