Universal soul is one of the main Keystone of the philosophy and the thought of the Upanishad. Brahma satyam Jagat Mitya Jeevo Bramanah Parah talks about the impermenance of the body and its existence.
The Divyavadana is a Sanskrit anthology of Buddhist avadana tales. They have originated in Mulasarvastivadin vinaya texts. It is dated to 2nd century CE.