ksanena kila bharata
tad adbhutam abhun mahat
tasya—his; abhipasyatah—while thus observing; kha-sthah—situated in the sky; ksanena—suddenly; kila—verily; bharata—O descendant of Bharata; gaja-matrah—just like an elephant; pravavrdhe—thoroughly expanded; tat—that; adbhutam—extraordinary; abhut—transformed; mahat—into a gigantic body.
O descendant of Bharata, while Brahma was observing Him, that boar became situated in the sky in a wonderful manifestation as gigantic as a great elephant.
Link to this page: https://prabhupadabooks.com/sb/3/13/19