Satapatha Brahmana Part V (SBE44), Julius Eggeling tr. [1900], at sacred-texts.com
11:3:2:11. Verily, whosoever knows the six pairs in the Agnihotra, has offspring born to him by pair after pair, by all generations. The Sacrificer and his wife--this is one pair: through it his Agnihotra would be possessed of a wife,--'May I obtain this pair!' he thinks 1. The calf and the Agnihotra-cow--this is another pair: through it his Agnihotra-cow would become possessed of a male calf,--'May I obtain this pair!' he thinks. The pot and the coals--this is another pair; the offering-spoon and the dipping-spoon--this is another pair; the Âhavanîya fire and the log--this is another pair; the libation and the Svâhâ-call--this is another pair: these, doubtless, are the six pairs in the Agnihotra; and he who thus knows them, has offspring born to him by pair after pair, by all generations.
48:1 Or, perhaps, it (the Agnihotra) thinks.