Isavasya OR Isa Upanisad
Chapter One
Brhadaranyaka Upanisad
Chandogya Upanisad
Taittiriya Upanisad
Aitareya Upanisad
Kausitaki Upanisad
Kena Upanisad
Katha Upanisad
Svetasvatara Upanisad
The Mundaka Upanisad
Prasna Upanisad
Mandukya Upanisad
Maitri Upanisad
Isavasya OR Isa Upanisad

The Isavasya or Isa Upanisad is traditionally placed first in collections of Upanisads. It belongs to the Vajasaneya Samhita of the White Yajurveda. Unlike the other Upanisads, it is included in the Samhita of the Veda itself (as ch. 40), rather than in a separate section. It takes its name from its first words (n.3 below). Some editions transpose vv. 9-11 and 12-14 and vv. 15-16 and 17-18.

The Isavasya is very difficult to date. It shows clear links on the one hand with the verse passages in Brhadaranyaka. IV, and on the other with the middle period verse Upanisads, particularly the Svetasvatara. I am inclined to favour the earlier date, since the author of the latter could well have known the Isavasya and been inspired by it without necessarily being to it in time.

OM. That is full; this is full;
Fullness comes forth from fullness:
When fullness is taken from fullness,
Fullness remains.

OM. Peace, peace, peace.