Ramayana
एवं मधुर्वरं लब्ध्वा देवात्सुमहदद्भुतम् । भवनं सो ऽसुरश्रेष्ठः कारयामास सुप्रभम् ॥ 7-61-16 ॥
"Having thus obtained this exceedingly wondrous boon from the god, Madhu, that best of the asuras, had a resplendent palace built."
english translation