The Neshamah present at the Eulogy: Shabbat 153a
The Neshamah mourning 7 days for the Body after Death: Shabbat 152a
The Neshamah travelling between the Earth and a higher plane for 12 months, until the body is gone: Shabbat 152b-153a
The body is like clothing for the Neshamah: Shabbat 152b
The Death of a Righteous person is a communal loss; the righteous soul still exists, just not within the community: Megillah 15a
The Neshamah of a righteous person is rewarded by being kept by Hashem's "throne," while that of the wicked is punished by being slingshot through Limbo by Angels after Death: Shabbat 152b