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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीभगवानुवाच । मा वेदगर्भ गास्तन्द्रीं सर्ग उद्यममावह । तन्मयाऽऽपादितं ह्यग्रे यन्मां प्रार्थयते भवान्
śrībhagavānuvāca | mā vedagarbha gāstandrīṃ sarga udyamamāvaha | tanmayā''pāditaṃ hyagre yanmāṃ prārthayate bhavān
SB 3.9.29