Digha Nikaya 1:679
SUJATOTathāgatassa kho, ānanda, cattāro iddhipādā bhāvitā bahulīkatā yānīkatā vatthukatā anuṭṭhitā paricitā susamāraddhā. So ākaṅkhamāno, ānanda, tathāgato kappaṁ vā tiṭṭheyya kappāvasesaṁ vā’”ti.
The Realized One has developed and cultivated the four bases of psychic power, made them a vehicle and a basis, kept them up, consolidated them, and properly implemented them. If he wished, the Realized One could live for the proper lifespan or what’s left of it.’”