Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.4.5

3.7.4.5

anu tvā mātā manyatāmanu piteti | sa hi mātuścādhi pituśca jāyate tadyata eva jāyate tata evaitanmedhyaṃ karotyanu bhrātā sagarbhyo 'nu sakhā sayūthya iti sa yatte janma tena tvānumatamārabha ityevaitadāhāgnīṣomābhyāṃ tvā juṣṭam prokṣāmīti tadyābhyāṃ devatābhyāmārabhate tābhyām medhyaṃ karoti

'May thy mother grant thee permission, and thy father--;' for it is from its mother and father that it is born: hence wherefrom it is born, thereby he thus makes it sacrificially pure; '--thine own brother, thy fellow in the herd;' whereby he means to say, 'whatever kin there is of thine, with their approval I slay thee.' 'I sprinkle thee, agreeable to Agni and Soma;' he thus makes it pure for those two deities for whom he slays it.