Dattatreya is a paradigmatic Sannyasi (monk) and one of the lords of Yoga, venerated as a Hindu god. In Maharashtra, Goa, Andhra Pradesh, Telangana, Karnataka, Gujarat, and Madhya Pradesh he is a syncretic deity, considered to be an avatar of the three Hindu/sanatan gods Brahma, Vishnu and Shiva, collectively known as the Trimurti. In other regions, and some versions of texts such as Garuda Purana, Brahma Purana and Sattvata Samhita, he is an avatar of Lord Vishnu only. Several Upanishads are dedicated to him, as are texts of the Vedanta-Yoga tradition in Sanatani/Hinduism.One of the most important texts of Hinduism, namely Avadhuta Gita (literally, "song of the free soul") is attributed to Dattatreya.Over time, Dattatreya has inspired many monastic movements in Shaivism, Vaishnavism and Shaktism, particularly in the Deccan region of India, south India, Gujarat, Madhya Pradesh, Rajasthan and Himalayan regions where Shiva tradition has been strong. His pursuit of simple life, kindness to all, sharing of his knowledge and the meaning of life during his travels is reverentially mentioned in the poems by Tukaram, a saint-poet of the Bhakti movement.
According to Rigopoulos, in the Nath tradition of Shaivism, Dattatreya is revered as the Adi-Guru (First Teacher) of the Adinath Sampradaya of the Nathas, the first "Lord of Yoga" with mastery of Tantra (techniques), although most traditions and scholars consider Adi Nath to be an epithet of Lord Shiva. According to Mallinson, Dattatreya is not the traditional guru of the Nath Sampradaya but instead was co-opted by the Nath tradition in about the 18th century as a guru, as a part of Vishnu-Shiva syncretism. This is evidenced by the Marathi text Navanathabhaktisara, states Mallinson, wherein there is syncretic fusion of the Nath Sampradaya with the Mahanubhava sect by identifying nine Naths with nine Narayanas.