Aitareyabrahmana 3.46

3.46

Three things indeed are done in the sacrifice: eaten, swallowed, and vomited.
That indeed is the 'eaten' one, when [a sacrificer] causes one who has expectations to act as priest,
[thinking:] 'Either he will give to me, or he will choose me.'
That goes away [from him], just as [what is] eaten; it does not benefit the sacrificer at all.
And that indeed is the 'swallowed' one, when [a sacrificer] out of fear causes [a priest] to act as priest,
[thinking:] 'Either he might not oppress me, or he might not ruin my sacrifice.'
That goes away [from him], just as [what is] swallowed; it does not benefit the sacrificer at all.
And that indeed is the 'vomited' one, when [a sacrificer] causes one who is being reviled to act as priest.
Just as men are disgusted by vomit, so are the gods by him.
That goes away [from him], just as [what is] vomited; it does not benefit the sacrificer at all.
He should not desire any of these three.
If any one of these three should befall him unintentionally,
there is an expiation for it in the chant of the vāmadevya.
This indeed, this vāmadevya is the world of the sacrificer, the immortal world, the heavenly world.
It is deficient by three syllables.
Approaching during its chant, he should divide himself into three [parts]: 'pu—ru—ṣa-'.
He places himself in these worlds:
in this world of the sacrificer, in this immortal world, in this heavenly world;
he overcomes every ill-offered sacrifice.
'Even if the priests should be fully qualified,' he used to say, 'he should still murmur this.'