Catudhātusutta

sn14.30:1.1 At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. …

sn14.30:1.2 “Mendicants, there are these four elements.

sn14.30:1.3 What four?

sn14.30:1.4 The elements of earth, water, fire, and air.

sn14.30:1.5 These are the four elements.”