Śatapatha Brāhmaṇa ("of a hundred paths") 6.2.1.19

6.2.1.19

teṣāṃ viṣamā raśanāḥ syuḥ | puruṣasya varṣiṣṭhātha hrasīyasyatha hrasīyasī tadyathārūpam paśūnāṃ raśanāḥ karotyapapavasyasāya sarvāstveva samāḥ syuḥ sarvāḥ sadṛśyaḥ sarve hyete samāḥ sarve sadṛśā agnayo hyucyante 'nnaṃ hyucyante tena samāstena sadṛśāḥ

Their ropes may be unequal; that of the man being the longest, then shorter and shorter: thus he makes the ropes according to the form of the animals, to avoid confusion between good and bad. But let them be all alike, all similar; for all these victims are alike, all similar, for they are (all) called Agnis, they are called food: hence they are alike and similar.