Śatapatha Brāhmaṇa ("of a hundred paths") 4.1.3.8

4.1.3.8

tasya devāḥ | yāvanmātramiva gandhasyāpajaghnustam paśuṣvadadhuḥ sa eṣa paśuṣu kuṇapagandhastasmātkuṇapagandhānnāpigṛhṇīta somasya haiṣa rājño gandhaḥ

The gods dispelled some of that smell, and laid it into the cattle,--this is that foul smell in (dead) cattle: hence one must not close (his nose) at that foul smell, since it is the smell of king Soma.