Shiva Purana
यत्तत्कारणमव्यक्तं व्यक्तं शिवमनामयम् ॥ तस्मात्संजायते ब्रह्मा द्विधाभूताद्धि कालतः ॥ ८॥
That which is the unmanifest ultimate cause becomes manifest as Śiva, free from ailment. When that becomes dichotomised, Brahma is born of that in due course.
english translation
yattatkAraNamavyaktaM vyaktaM zivamanAmayam ॥ tasmAtsaMjAyate brahmA dvidhAbhUtAddhi kAlataH ॥ 8॥
hk transliteration by Sanscript