Shiva Purana
तत्र कार्यं च करणं संसिद्धं ब्रह्मणो यदा ॥ तदंडे सुप्रवृद्धो ऽभूत्क्षेत्रज्ञो ब्रह्मसंज्ञितः ॥ २१ ॥
When thus the activities of Brahmā are fulfilled Brahmā becomes flourished in that Egg.
english translation
tatra kAryaM ca karaNaM saMsiddhaM brahmaNo yadA ॥ tadaMDe supravRddho 'bhUtkSetrajJo brahmasaMjJitaH ॥ 21 ॥
hk transliteration by Sanscript