Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.4.1

1.1.4.1

atha kṛṣṇājinamādatte | yajñasyaiva sarvatvāya yajño ha devebhyo 'pacakrāma sa kṛṣṇo bhūtvā cacāra tasya devā anuvidya tvacamevāvacāyājahruḥ

He now takes the black antelope skin, for completeness of the sacrifice. For once upon a time the sacrifice escaped the gods, and having become a black antelope roamed about. The gods having thereupon found it and stripped it of its skin, they brought it (the skin) away with them.