Śatapatha Brāhmaṇa ("of a hundred paths") 1.6.3.30

1.6.3.30

atharcamanūcyarcā yajati | tadanvimā ubhayatodantāḥ prajāḥ prajāyante 'sthi hyṛgasthi hi danta ubhayato hyetadasthi karotyetā vā imā dvayyaḥ prajā anyataratodantāścaivobhayatodantāśca sa yo haivaṃ vidvānagnīṣomayoḥ prajātiṃ yajati bahurhaiva prajayā paśubhirbhavati

Having recited (at the low-voiced offering) a Rik-verse as the anuvâkyâ, he recites as the yâgyâ a (second) Rik-verse: in consequence of this, creatures with teeth on both sides are brought forth here; for the Rik means bone and the tooth also is bone, so that he thereby produces bone on both sides. These creatures, indeed, are of two kinds, viz. such as have teeth on one side only, and such as have teeth on both sides; and verily he who sacrifices, knowing thus the generative power of Agni and Soma, becomes rich in offspring and cattle.