Catudhātusutta

Ekaṁ samayaṁ bhagavā sāvatthiyaṁ viharati jetavane anāthapiṇḍikassa ārāme … “catasso imā, bhikkhave, dhātuyo. Katamā catasso? Pathavīdhātu, āpodhātu, tejodhātu, vāyodhātu— imā kho, bhikkhave, catasso dhātuyo”ti. Paṭhamaṁ.

At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. … “Mendicants, there are these four elements. What four? The elements of earth, water, fire, and air. These are the four elements.”