The sage Maitreya said: O Vidura, after observing the source of his appearance, namely the Personality of Godhead, Brahmā prayed for His mercy as far as his mind and words would permit him. Thus having prayed, he became silent, as if tired from his activities of penance, knowledge and mental concentration.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मैत्रेय उवाच । स्वसम्भवं निशाम्यैवं तपोविद्यासमाधिभिः । यावन्मनो वचः स्तुत्वा विरराम स खिन्नवत्
maitreya uvāca | svasambhavaṃ niśāmyaivaṃ tapovidyāsamādhibhiḥ | yāvanmano vacaḥ stutvā virarāma sa khinnavat
SB 3.9.26