The Avadhuta Gita is among the most direct of all nondual texts. Where most teaching texts build a method, the Avadhuta Gita simply declares. There is no graduated path here, no scaffolding, no accommodation for the seeker. The text speaks as the awakened do: from what is, not toward it.
Avadhuta names the one who has cast off all distinctions, including the distinction between renunciation and worldly life. Dattatreya, the figure to whom this text is attributed, is the patron of all who have gone beyond categories. He is depicted with the dog of forgotten origins and the cow of natural mind, beyond caste and beyond order, naked or clothed without preference.
Chapter one
1.1
By the grace of God alone the desire for nonduality arises in wise people, to save them from great fear.
1.2
The Self pervades all this universe. Pure, beyond happiness and misery, is the One Self. How shall I worship that?
1.3
The five elements compose the universe like the water of a mirage. To whom shall I bow? I am the One pure consciousness.
[ A representative selection. The avadhuta continues across eight short chapters, each more uncompromising than the last. The complete Shastri 1934 edition is at the source linked above. ]