May the Supreme Personality of Godhead, who bears the Śrīvatsa on His chest, protect me after midnight until the sky becomes pinkish. May Lord Janārdana, who carries a sword in His hand, protect me at the end of night [during the last four ghaṭikās of night]. May Lord Dāmodara protect me in the early morning, and may Lord Viśveśvara protect me during the junctions of day and night.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीवत्सधामापररात्र ईशः प्रत्यूष ईशोऽसिधरो जनार्दनः । दामोदरोऽव्यादनुसन्ध्यं प्रभाते विश्वेश्वरो भगवान् कालमूर्तिः
śrīvatsadhāmāpararātra īśaḥ pratyūṣa īśo'sidharo janārdanaḥ | dāmodaro'vyādanusandhyaṃ prabhāte viśveśvaro bhagavān kālamūrtiḥ
SB 6.8.22