Shiva Purana
षड्गुणेन तपोलोकात्सत्यलोको व्यवस्थितः ॥ ब्रह्मलोकः स विज्ञेयो वसंत्यमलचेतसः ॥ १५॥
The world of truth is established by the sixfold world of austerities. That is to be understood as the Brahmaloka where the pure-minded reside.
english translation
SaDguNena tapolokAtsatyaloko vyavasthitaH ॥ brahmalokaH sa vijJeyo vasaMtyamalacetasaH ॥ 15॥
hk transliteration by Sanscript