Where is then that person? - Brihadaranyaka Upanishad

When the speech of this dead person enters into the fire, breath into the air, the eye into the sun, the mind into the moon, the hearing into space, into the earth the body, into the ether the self, into the shrubs the hairs of the body, into the trees the hairs of the head, when the blood and the seed are deposited in the water, where is then that person? - Brihadaranyaka Upanishad

If the person is no more, what then is rebirth, heaven, or hell ?

"When the body is no more, the person disappears completely without return, only the witness remains and the Great Unknown." - Nisargadatta Maharaj