Shatapatha Brahmana 8.4.3.9

8.4.3.9

trayodaśabhirastuvateti | daśa prāṇā dve pratiṣṭhe ātmā trayodaśastenaiva tadastuvata māsā asṛjyanteti māsā atrāsṛjyanta saṃvatsaro 'dhipatirāsīditi saṃvatsaro 'trādhipatirāsīt

'With thirteen they sang praises,'--there are ten vital airs, and two feet, and the trunk is the thirteenth: it is therewith they then sang praises;--'the months were created,'--the months indeed were now created;--'the year was the lord!' the year indeed was now the lord.