Chāndogya Upaniṣad 2.12

2.12.1

abhimanthati sa (S )kāraḥ \
dhūmo jāyate sa prastāvaḥ \
jvalati sa udgīthaḥ \
aṅgārā bhavanti sa pratihāraḥ \
upaśāmyati tan nidhanam \
saṃśāmyati tan nidhanam \
etad rathaṃtaram agnau protam \\212.1\

1. One rubs the fire-sticks together—that is a Hiṅkāra.
Smoke is produced—that is a Prastāva.
It blazes—that is an Udgītha.
Coals are formed—that is a Pratihāra.

It becomes extinct—that is a Nidhana. It becomes completely extinct—that is a Nidhana. This is the Rathantara Sāman as woven upon fire.

2.12.2

sa ya evam etad rathaṃtaram agnau protaṃ veda \
brahmavarcasy: annādo bhavati \
sarvam āyur eti \
jyog jīvati \
mahān prajayā paśubhir bhavati \
mahān kīrtyā \
na pratyaṅṅ agnim ācāmen na niṣṭhīvet \
tad vratam \\212.2\

2. He who knows thus this Rathantara Sāman as woven upon fire becomes an eater of food, eminent in sacred knowledge, reaches a full length of life, lives long, becomes great in offspring and in cattle, great in fame. One should not take a sip and spit toward fire. That is his rule.