Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.3.16

2.3.3.16

sa yatprāṅupodaiti | tadenām prācīmabhyajati svargaṃ lokamabhi tayā svargaṃ lokaṃ samaṣnute tasyā uttarata ārohaṇaṃ sainaṃ svargaṃ lokaṃ samāpayatyatha yo dakṣiṇata etyāste yathā pratīrṇāyāmāgacetsa vihīyeta sa tata eva bahirdhā syādevaṃ tat

Now when he walks up towards the east, then he steers that (ship) eastwards towards the heavenly world, and he gains the heavenly world by it. When ascended from the north it makes him reach the heavenly world; but if one were to sit down in it after entering from the south, it would be as if he tried to enter it after it has put off and he were left behind and remained outside.