Based on the title and the language (Kinyarwanda/Kirundi), this refers to a well-known piece of East African literature, specifically a historical narrative or epic poem. Here is the context regarding the story and the file you are looking for:
He famously told President Grégoire Kayibanda in 1972 that he would not rule for more than three years and that his grave would be difficult to find. Kayibanda was overthrown in 1973. Ubuhanuzi Bwa Magayane Pdf Downloadl