TIPITAKA Volume 16 : PALI ROMAN Sutta Pitaka Vol 8 : Sutta. Saṃ. Ni. Catutthavaggo catuttho

[403] Ekaṃ samayaṃ bhagavā sāvatthiyaṃ viharati jetavane anāthapiṇḍikassa ārāme . catasso imā bhikkhave dhātuyo . Katamā catasso . paṭhavīdhātu āpodhātu tejodhātu vāyodhātu . Imā kho bhikkhave catasso dhātuyoti. Paṭhamaṃ.