Bhagavatapurana 5.20.39

5.20.39

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tad-upariṣṭāc catasṛṣv āśāsvātma-yoninākhila-jagad-guruṇādhiniveśitā ye dvirada-pataya ṛṣabhaḥ puṣkaracūḍo vāmano 'parājita iti sakala-loka-sthiti-hetavaḥ //

39. Beyond that, at the four cardinal points, four great elephants are stationed by the Father of all the worlds who is born of Atman—_Viz_; Rishabha, Pushkarachooda, Vamana, and Aparajita, for the sake of maintaining the worlds in position.