The Sutra of the Question of Subahu
The Sutra of the Question of Subāhu (Skt. Subāhuparipṛcchāsutra, Tib. ལག་བཟངས་ཀྱིས་ཞུས་པའི་མདོ།, Wyl. lag bzangs kyis zhus pa’i mdo). It’s the twenty-sixth section of the Heap of Jewels sutra in the Tibetan Kangyur (Toh 70). In this sutra, in response to Subahu’s question, the Buddha describes how a bodhisattva should train in the six perfections.