Chandogya Upanishad is one of the oldest Upanishads written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Sama Veda. It is the part of Chandogya Brahaman that contains eight chapters. The 3rd Khanda of Chapter Six of Chandogya Upanishad states about the threefold development. Uddalaka, the son of Aruna told his son Svetaketu that there are three sources for all the living beings, those born from an egg, those born from a living being and those born from a sprout. The deity thought of entering into the three deities by means of this living self and developing names and forms. It thought of converting each of these three sources into a tripartite form. The deity entered the three elements (devatas) in the form of life manifested them with the names and forms.
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