Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/22/16

विष्णुस्तत्रैव सुष्वाप प्रकृत्या स्वस्त्रिया सह ।। तन्नाभिकमलाज्जातो ब्रह्मा शंकरशासनात् ।। १६ ।।

sanskrit

Viṣṇu slept there itself along with his consort Prakṛti. At the behest of Śiva, Brahmā was born of his umbilical lotus.

english translation

viSNustatraiva suSvApa prakRtyA svastriyA saha || tannAbhikamalAjjAto brahmA zaMkarazAsanAt || 16 ||

hk transliteration by Sanscript