Ratnagotravibhaga (Uttaratantra Shastra)

The Ratnagotravibhaga, also known as the Uttaratantra Shastra, attributed to Maitreya with a commentary by Asanga, is the classical Indian Buddhist treatise that systematised the buddha-nature, or tathagatagarbha, teaching, and it is the text at the centre of the later Tibetan rangtong-shentong dispute over how its positive language about buddha-nature is properly read. As a primary scriptural and philosophical text, it is authoritative for what the treatise itself actually says, which grounds both sides of that later interpretive dispute. It records the classical Indian source text, not any one side's later reading of it, so a claim about how a specific tradition interprets it needs that tradition's own commentarial source alongside this one.