Shatapatha Brahmana 10.6.5.4

10.6.5.4

so'kāmayata dvitīyo ma ātmā jāyeteti sa manasā vācam mithunaṃ samabhavadaśanāyām mṛtyustadyadreta āsītsa saṃvatsaro'bhavanna ha purā tataḥ saṃvatsara āsa tametāvantaṃ kālamabibharyāvāntsaṃvatsarastametāvataḥ kālasya parastādasṛjata taṃ jātamabhivyādadātsa bhāṇakarotsaiva vāgabhavat

He desired, 'May a second self be produced for me.' By his mind he entered into union with speech,--(to wit) Death with hunger: the seed which was produced became the year, for theretofore there was no year. For as long as the year he (Death) carried him (within him), and at the end of that time he produced him. He opened his mouth (to devour) the new-born one, and he (the child) cried 'bhân'; thus speech was produced.