After hearing this, Vidura inquired from Maitreya: My dear master, how is it that the three deities Brahmā, Viṣṇu and Śiva, who are the creator, maintainer and destroyer of the whole creation, became the offspring of the wife of Atri Muni?
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
विदुर उवाच । अत्रेर्गृहे सुरश्रेष्ठाः स्थित्युत्पत्त्यन्तहेतवः । किञ्चिच्चिकीर्षवो जाता एतदाख्याहि मे गुरो
vidura uvāca | atrergṛhe suraśreṣṭhāḥ sthityutpattyantahetavaḥ | kiñciccikīrṣavo jātā etadākhyāhi me guro
SB 4.1.16