Consolation is Considered an extension of the Covenant of Avraham: Ketuvot 8b
Gd consoles the bereaved; so should we: Sotah 14a
The Act of Consolation
How to console: Ketuvot 8b
Accepting consolation for a Eved Kenaani: Berachot 16b
Consolation during the 30 day period, during the Year, and after the year: Moed Katan 21b
Consolation for one who lost his wife, if he remarried during the 30 days: Moed Katan 21b
Consolation at the burial is only done if the spine of the deceased is intact: Moed Katan 25a
Consolers should wait for the mourner to speak first: Moed Katan 28b
One should not console after the mourner has visibly consoled himself: Moed Katan 27b
Having spices and perfumes in the house of relatives who visit the mourner, and making the Blessing on the spices' Scents: Moed Katan 27a