Śatapatha Brāhmaṇa ("of a hundred paths") 11.7.3.3

11.7.3.3

atha ya eṣa ānataḥ upariṣṭādapanato madhye so'śanāyai rūpaṃ sa yo ha tādṛśaṃ yūpaṃ kurute'śanāyukā hāsya bhāryā bhavanti tasmāttādṛśamannādyakāmo yūpaṃ na kurvītātha ya eṣa ānata upariṣṭādupanato madhye so'nnādyasya rūpaṃ tasmāttādṛśamannādyakāmo yūpaṃ kurvīta

And such a one as is bent at the top, and bent outwards in the middle, is a type of hunger (poverty); and if any one makes such a one his sacrificial stake, his dependants will certainly be hungry; therefore let no one wishing for food make such a one his sacrificial stake. But such a one as is bent at the top and bent inwards in the middle, is a type of food (prosperity): therefore let him who wishes for food make such a one his sacrificial stake.