Agnihotra yajna while eating
(From Chandogya upanishad)
'Therefore the first food which a man may take, is in the place of Homa. And he who offers that first oblation, should offer it to Prâna (up-breathing), saying Svâhâ. Then Prâna (up-breathing) is satisfied,
'If Prâna is satisfied, the eye is satisfied, if the eye is satisfied, the sun is satisfied, if the sun is satisfied, heaven is satisfied, if heaven is satisfied, whatever is under heaven and under the sun is satisfied.. And through their satisfaction he (the sacrificer or eater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.
And he who offers the second oblation, should offer it to Vyâna (back-breathing), saying Svâhâ. Then Vyâna is satisfied,
'If Vyâna is satisfied, the ear is satisfied, if the ear is satisfied, the moon is satisfied, if the moon is satisfied, the quarters are satisfied, if the quarters are satisfied, whatever is under the quarters and under the moon is satisfied. And through their satisfaction he (the sacrificer or eater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.
'And he who offers the third oblation, should offer it to Apâna (down-breathing), saying Svâhâ. Then Apâna is satisfied. If Apâna is satisfied, the tongue is satisfied, if the tongue is satisfied, Agni (fire) is satisfied, if Agni is satisfied, the earth is satisfied, if the earth is satisfied, whatever is under the earth and under fire is satisfied.
'And through their satisfaction he (the sacrificer or eater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.
'And he who offers the fourth oblation, should offer it to Samâna (on-breathing), saying Svâhâ. Then Samâna is satisfied,
'If Samâna is satisfied, the mind is satisfied, if the mind is satisfied, Parganya (god of rain) is satisfied, if Parganya is satisfied, lightning is satisfied, if lightning is satisfied, whatever is under Parganya and under lightning is satisfied. And through their satisfaction he (the sacrificer or cater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.
'And he who offers the fifth oblation, should offer it to Udâna (out-breathing), saying Svâhâ. Then Udâna is satisfied,
'If Udâna is satisfied, Vâyu (air) is satisfied, if Vâyu is satisfied, ether is satisfied, if ether is satisfied, whatever is under Vâyu, and under the ether is satisfied. And through their satisfaction he (the sacrificer or eater) himself is satisfied with offspring, cattle, health, brightness, and Vedic splendour.
'If, without knowing this, one offers an Agnihotra, it would be as if a man were to remove the live coals and pour his libation on dead ashes.
But he who offers this Agnihotra with a full knowledge of its true purport, he offers it (i.e. he eats food) 1 in all worlds, in all beings, in all Selfs.
'As the soft fibres of the Ishîkâ reed, when thrown into the fire, are burnt, thus all his sins are burnt whoever offers this Agnihotra with a full knowledge of its true purport.
Even if he gives what is left of his food to a Kandâla, it would be offered in his (the Kandâla's) Vaisvânara Self. And so it is said in this Sloka:--
'As hungry children here on earth sit (expectantly) round their mother, so do all beings sit round the Agnihotra, yea, round the Agnihotra.'