Mahāyāna Mahāparinirvāṇa Sūtra
Though the tathagatagarbha and the Buddha-nature have not exactly the same meaning, in the Buddhist tradition they became equated. In the "Angulimaliya Sūtra" and in the "Mahāyāna Mahāparinirvāṇa Sūtra" the terms "Buddha-nature" ("Buddha-dhātu") and "tathāgatagarbha" are synonyms.