Saurapurana 24.59

24.59

mayaiva sṛṣṭaḥ suṣṭyarthaṃ tvameva ca janārdanaḥ
varaṃ dadāmi te brahmanvarayasva yathepsitam

You were created by me alone for the sake of creation, and so was Janārdana. / I grant you a boon, O Brahman; choose whatever you desire.”