Shatapatha Brahmana 13.6.1.7

13.6.1.7

sa vā eṣa puruṣamedhaḥ pañcarātro yajñakraturbhavati pāṅkto yajñaḥ pāṅktaḥ paśuḥ pañcartavaḥ samvatsaro yatkiṃ ca pañcavidhamadhidevatamadhyātmaṃ tadenena sarvamāpnoti

Now this Purushamedha is a five-days’ sacrificial performance--the sacrifice is fivefold, the victim is fivefold, and five seasons are a year: whatsoever of five kinds there is, either concerning the deity or the self (body), all that he thereby obtains.