Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 9
Sanskrit:
यावानयं वै पुरुषो यावत्या संस्थया मित: ।तावानसावपि महापुरुषो लोकसंस्थया ॥ ९ ॥
ITRANS:
yāvān ayaṁ vai puruṣoyāvatyā saṁsthayā mitaḥtāvān asāv api mahā-puruṣo loka-saṁsthayā
Translation:
Just as one can determine the dimensions of an ordinary person of this world by measuring his various limbs, one can determine the dimensions of the Mahāpuruṣa by measuring the arrangement of the planetary systems within His universal form.