Shatapatha Brahmana 10.6.5.1

10.6.5.1

naiveha kiṃ canāgra āsīt mṛtyunaivedamāvṛtamāsīdaśanāyayāśanāyā hi mṛtyustanmano'kurutātmanvī syāmiti so'rcannacarattasyārcata āpo'jāyantārcate vai me kamabhūditi tadevārkyasyārkatvaṃ kaṃ ha vā asmai bhavati ya evametadarkyasyārkatvaṃ veda

Verily, there was nothing here in the beginning: by Death this (universe) was covered, by hunger, for Death is hunger. He created for himself this mind, thinking, 'May I have a soul.' He went on worshipping. Whilst he was worshipping the waters were produced. 'Verily, to me worshipping (ark) water (kam) has been produced,' thus (he thought): this, indeed, is the Arka-nature of the Arkya; and, verily, there is joy (kam) for him who thus knows the Arka-nature of the Arkya.