Śrīmad-Bhāgavatam · Text 3.9.29
Who is speaking and story frame
श्रीभगवानुवाच
मा वेदगर्भ गास्तन्द्रीं सर्ग उद्यममावह ।
तन्मयापादितं ह्यग्रे यन्मां प्रार्थयते भवान् ॥ २९ ॥
śrī-bhagavān uvāca
mā veda-garbha gās tandrīṁ
sarga udyamam āvaha
tan mayāpāditaṁ hy agre
yan māṁ prārthayate bhavān
The Supreme Personality of Godhead then said: O Brahmā, O depth of Vedic wisdom, be neither depressed nor anxious about the execution of creation. What you are begging from Me has already been granted before.
Read Śrīla Prabhupāda's purport on Vedabase.io