Jaiminīya (Talavakāra) Brāhmaṇa 8.32

He saw this sāman.
He praised with it.
Then indeed he measured out day after day.
As to why this sāman is [used], they measure out day after day by it.
It was this that Kruṅ Āṅgirasa drank apart, day after day.
When people say, 'The curlew drinks milk apart [from water],' it is not the curlew that drinks it apart;
it was Kruṅ Āṅgirasa who drank apart day after day.
Kruṅ Āṅgirasa, desiring the heavenly world, practiced ascetic toil.
He saw this sāman.
He praised with it.
Then indeed he attained the heavenly world.
This is a sāman that leads to heaven.
He attains the heavenly world who knows thus.
It has an upward iḷā, the form of the Bṛhat, on the day connected with the Bṛhat.
Thereby it is endowed with proper form.
And because Kruṅ Āṅgirasa saw it, it is therefore called Krauñca.
'The bull of thoughts clarifies himself, far-seeing' — thus there are [verses] containing the word 'bull'.
This day is connected with the Bṛhat, in the Triṣṭubh meter, the form of the ruling power.

Upon them [is sung] the Yāma.
This day, the second, is, as it were, a twin.
Just as twins are born, so is this day.
By twin [chants] Yama [ascended]... having blocked [him] out of the world, he mounted his world.
He blocks his spiteful rival from his world and mounts his world, who knows thus.
By a mantra the ṛṣis possess a primary cause; by the Yāma, Yama [possesses one].
They hold the sacrificial session [thinking]: 'May we possess a primary cause.'
They indeed come to possess a primary cause.
Now, the home is a primary cause; offspring is a primary cause; cattle are a primary cause; the heavenly world is a primary cause.
He comes to possess a primary cause who knows thus.
The gods consecrated Yama Vaivasvata for yonder world.
He desired: 'May I possess a primary cause in this world.'
He saw these Yāma sāmans.
He praised with them.
Through them he came to possess a primary cause in this world.
He has this as his primary cause in this world, and has these offspring, by these very sāmans, who knows these sāmans thus.
Thereby possessing a primary cause in this world, he attains sonship to Yama, who knows thus.
As to that, they say: 'These sāmans have the fathers as their deity.'
'He is liable to go to yonder world before his full lifespan,' so one uses as a stobha 'āyus' (life), and also 'vāyus' (wind).
Thus indeed he does not go to yonder world before his full lifespan.
And because Yama saw it, it is therefore called Yāma.