Chhandogya-Upanishad
Sentence 7
iti shashthah khandah ||6||
इति षष्ठः खण्डः ॥६॥
iti ṣaṣṭhaḥ khaṇḍaḥ ॥6॥
This was chapter six
iti (इति, iti) = this one
shashthah (षष्थः, ṣaṣthaḥ) =
khandah (खण्डः, khaṇḍaḥ) =
The oldest of the Upanishad texts originated from the 6th century B.C. – including the Chandogya Upanishads. This extract from chapter VIII.6 is perhaps the first mention of the Nadis.