The Avadhoota Gita is writen by Sage Dattatreya.
Dattatreya was the combined incarnation of Brahma, Vishnu and Shiva. His narration was recorded by his two disciples Swami and Kartika.
It is undoubtedly one of the oldest Hindu scriptures. Hindu scholars speculate it must have been written not less than 5000 B.C, or even earlier. Still the texts is readable for laymen.
‘The Avadhoota Gita’ must be one of the oldest spiritual scripts we can get our hands on.