Shatapatha Brahmana 11.1.6.7

11.1.6.7

so'rcañcrāmyaṃścacāra prajākāmaḥ sa ātmanyeva prajātimadhatta sa āsyenaiva devānasṛjata te devā divamabhipadyāsṛjyanta taddevānāṃ devatvaṃ yaddivamabhipadyāsṛjyanta tasmai sasṛjānāya divevāsa tadveva devānāṃ devatvaṃ yadasmai sasṛjānāya divevāsa

Desirous of offspring, he went on singing praises and toiling. He laid the power of reproduction into his own self. By (the breath of) his mouth he created the gods: the gods were created on entering the sky; and this is the godhead of the gods (deva) that they were created on entering the sky (div). Having created them, there was, as it were, daylight for him; and this also is the godhead of the gods that, after creating them, there was, as it were, daylight (diva) for him.