H. P. Blavatsky

Devachan. The “dwelling of the gods”. A state intermediate between two earth‐lives, into which the EGO (Atmâ‐Buddhi‐Manas, or the Trinity made One) enters, after its separation from Kâma Rupa, and the disintegration of the lower principles on earth.

Source: H. P. Blavatsky, The Theosophical Glossary, art. Devachan