Mahabharata 14.42.18

त्रीणि स्थानानि भूतानां चतुर्थं नोपपद्यतेस्थलमापस्तथाकाशं जन्म चापि चतुर्विधम्

trīṇi sthānāni bhūtānāṃ caturthaṃ nopapadyatesthalamāpastathākāśaṃ janma cāpi caturvidham

Our plain-language meaning of this verse is waiting for scholar review.