Markandeyapurana 3.46

3.46

bhakṣayasva suviśrabdhau māmatra dvijasattama /
āhārīkṛtametat te mayā dehamihātmanaḥ //

“Having thus addressed us, he next said to that bird, ‘When I have performed for myself the final sacrifice, and my obsequies, according to the Śāstras, do thou unhesitatingly eat me here, (O best of dvijas): this my body I here grant thee for food. The brahmanhood of a brahman is deemed such, so far indeed as he maintains his truthfulness, O chief of the feathered race. Not by sacrifices accompanied with presents, nor by any other act, do brahmans acquire such great virtue as by the of truth.’