Ayoguḷasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 1214

[1214] Ānanda, on that occasion the body of the Tathāgata rises up from the earth into the air with hardly any difficulty. He wields the various kinds of psychic power (iddhividha): having been one, he becomes many; having been many, he becomes one … he exercises mastery with his body even as far as the Brahmā world.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places

Vol. 19 · Section 1247 — Tathāgatasutta
Vol. 19 · Section 1227 — Dutiyaānandasutta