Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 16
Sanskrit:
विभावसोरसूतोषा व्युष्टं रोचिषमातपम् ।पञ्चयामोऽथ भूतानि येन जाग्रति कर्मसु ॥ १६ ॥
ITRANS:
vibhāvasor asūtoṣāvyuṣṭaṁ rociṣam ātapampañcayāmo ’tha bhūtāniyena jāgrati karmasu
Translation:
Ūṣā, the wife of Vibhāvasu, gave birth to three sons — Vyuṣṭa, Rociṣa and Ātapa. From Ātapa came Pañcayāma, the span of day, who awakens all living entities to material activities.