Śrīmad-Bhāgavatam 3.13.19

tasyahis — his; abhipaśyataḥwhile thus observing — while thus observing; khasituated in the sky-sthaḥsituated in the sky — situated in the sky; kṣaṇenasuddenly — suddenly; kilaverily — verily; bhārataO descendant of Bharata — O descendant of Bharata; gajajust like an elephant-mātraḥjust like an elephant — just like an elephant; pravavṛdhethoroughly expanded — thoroughly expanded; tatthat — that; adbhutamextraordinary — extraordinary; abhūttransformed — transformed; mahatinto a gigantic body — into a gigantic body.