Taittiriyabrahmana 3.10.11

A certain one, having departed from this world,
knows himself:
"Here I am."
A certain one does not recognise his own world;
bewildered by the fire, choked by smoke,
he does not recognise his own world.
Now, whoever knows this Sāvitra fire,
he, having departed from this world,
knows himself:
"Here I am."

He recognises his own world.
And this Sāvitra fire then
carries him up to the heavenly world.
Indeed, this [work] is done by the yoked day-and-nights:
"They have been initiated for so many nights;
they have undertaken the vow for so many nights."
For one who does not know thus,
they suck out his treasure in yonder world;
he goes after a treasure that has been sucked dry.
Now, whoever knows this Sāvitra fire,

for him, the day-and-nights
do not suck out his treasure in yonder world;
he goes after a treasure that has not been sucked dry.
Bharadvāja lived in Vedic studentship for three lifespans.
To him, lying there, worn out and old,
Indra came up and said:
"Bharadvāja,
if I were to give you a fourth lifespan,
what would you do with it?"
"I would practice Vedic studentship with it," he said.

He showed him three mountain-like shapes, as if unknown.
From each of them he took a handful.
Addressing him,
he said: "Bharadvāja,
these are the Vedas;
infinite indeed are the Vedas.
This is what you have studied through these three lifespans;
now, the rest of yours remains unstudied.
Come, know this;
this indeed is all-knowledge."

To him he spoke this Sāvitra fire.
Having known it,
having become immortal,
he went to the heavenly world,
to union with Āditya.
Having become immortal,
he goes to the heavenly world,
to union with Āditya,
who knows thus.
This indeed is the threefold knowledge.

As great a world as one wins by the threefold knowledge,
so great a world he wins,
who knows thus.
These are the names of Agni;
he attains union and the same world with Agni,
who knows thus.
These are the names of Vāyu;
he attains union and the same world with Vāyu,
who knows thus.
These are the names of Indra;

he attains union and the same world with Indra,
who knows thus.
These are the names of Bṛhaspati;
he attains union and the same world with Bṛhaspati,
who knows thus.
These are the names of Prajāpati;
he attains union and the same world with Prajāpati,
who knows thus.
These are the names of Brahman;
he attains union and the same world with Brahman,
who knows thus.
That fire, wingless and tailless, is Vāyu indeed;
Agni is his mouth,
yonder Āditya is his head.
Whatever is between these two deities,
that he stitches together entirely;
therefore is it Sāvitra.