Shatapatha Brahmana 10.6.5.6

10.6.5.6

so'kāmayata bhūyasā yajñena bhūyo yajeyeti so'śrāmyatsa tapo'tapyata tasya śrāntasya taptasya yaśo vīryamudakrāmatprāṇā vai yaśo vīryaṃ tatprāṇeṣūtkrānteṣu śarīraṃ śvayitumadhriyata tasya śarīra eva mana āsīt

He desired, 'May I again sacrifice by yet another sacrifice.' He wearied himself and practised austerity. From him, thus wearied and heated, glory and vigour departed; and glory and vigour, indeed, are the vital airs. The vital airs having departed, that body of his began to swell. The mind was yet in the body;--