Shiva Purana
उपर्युपरि चान्योन्यमेवं दशगुणाधिकम् ॥ ब्रह्माण्डमिति विज्ञेयं तद्द्विजैर्मुनिनायक ॥ ४८॥
The world above is ten times more than the one below. O leading sage, the universe shall be known thus by those who desire to know that.
english translation
uparyupari cAnyonyamevaM dazaguNAdhikam ॥ brahmANDamiti vijJeyaM taddvijairmuninAyaka ॥ 48॥
hk transliteration by Sanscript