Shiva Purana
नाभीकमलकोशात्तु कोटिशः कमलासनाः॥ कल्पे कल्पे पुरा ह्यान्सत्यं योगबलाद्विभो॥ २८॥
O lord, it is true that from within the lotus from my navel, crores of lotus-seated Brahmās have come out in the different Kalpas through the power of Yoga.
english translation
nAbhIkamalakozAttu koTizaH kamalAsanAH॥ kalpe kalpe purA hyAnsatyaM yogabalAdvibho॥ 28॥
hk transliteration by Sanscript