The threefold heaven recovered by Vamana's steps
'Pratyaditsus trivistapam' (SB 1.3.19).
स्वर्ग
Also known as Trivistapa (the threefold heaven)
Svarga (Trivistapa) is Indra's heaven of Hindu cosmology: the impermanent fruit-bearing realm of merit. SB 1.3.19: it was this threefold heaven that Vamana's steps reclaimed; at SB 1.1.4 the sages' sacrifice was likewise undertaken 'for heaven and the worlds'.
Śrīmad Bhāgavata Mahāpurāṇa 1.3.19 — Sanskrit Wikisource (pinned oldid=369178)
'Pratyaditsus trivistapam' (SB 1.3.19).