The concept of Tathāgatagarbha, or Buddha-nature, is a central idea in Mahayana Buddhism that refers to the inherent potential for enlightenment within all beings. This concept is discussed in various sutras and texts, which serve as important sources for understanding Tathāgatagarbha.

One of the main sutras that discusses Tathāgatagarbha is the Tathāgatagarbha Sutra, also known as the Srīmālādevī Siṃhanāda Sutra. This sutra presents the idea that all beings possess an inherent Buddha-nature, which is obscured by defilements and can be realized through the practice of the Dharma. It also emphasizes the equality of all beings in terms of their potential for enlightenment.

Another important text is the Mahāparinirvāṇa Sutra, which contains the famous statement, "All sentient beings possess the Buddha-nature, but it is obscured by their temporary defilements." This sutra also discusses the idea of the Tathāgatagarbha as the ultimate reality and the true nature of all beings.

The Lankāvatāra Sutra, a text that focuses on the nature of consciousness and the mind, also discusses Tathāgatagarbha. It presents the idea that the Tathāgatagarbha is the true self, or the pure and unchanging essence of the mind, which can be realized through the practice of meditation and insight.

The Uttaratantra, or Ratnagotravibhāga, is a treatise on the Tathāgatagarbha written by Maitreya and attributed to Asanga. This text explains the concept of Tathāgatagarbha in great detail, discussing its qualities, how it is obscured by defilements, and how it can be realized through the practice of the Dharma.

Other sutras and texts that discuss Tathāgatagarbha include the Mahāyāna Mahāparinirvāṇa Sutra, the Śrīmālādevī Siṃhanāda Sutra, and the Laṅkāvatāra Sutra. These texts all present different perspectives and explanations of the concept of Tathāgatagarbha, providing a comprehensive understanding of this important idea in Mahayana Buddhism.

In conclusion, the main sutras and texts that discuss Tathāgatagarbha are the Tathāgatagarbha Sutra, the Mahāparinirvāṇa Sutra, the Lankāvatāra Sutra, and the Uttaratantra. These texts serve as important sources for understanding the concept of Buddha-nature and its significance in the path towards enlightenment.