Shiva Purana

siva.sh/siva-purana/saturda-samhita/9/28

नाभीकमलकोशात्तु कोटिशः कमलासनाः।। कल्पे कल्पे पुरा ह्यान्सत्यं योगबलाद्विभो।। २८।।

sanskrit

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