Dhammapada 4.2.p1

4.2.p1

Pheṇūpamanti imaṃ dhammadesanaṃ satthā sāvatthiyaṃ viharanto aññataraṃ marīcikammaṭṭhānikaṃ bhikkhuṃ ārabbha kathesi.

He who knows that this body is like foam. This religious instruction was given by the Teacher while in residence at Sāvatthi with reference to a certain monk who meditated on a mirage.