The Vishnu Sahasranam is found in the Mahabharatha. Literally translated this means thousand names of Vishnu. This is found in the Anushasanika Parvam of Mahabharatha.
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Meaning of Vishnu Kannada Discourse by Sri Bannanje Govindacharya in Padma Purana
Visit http://yousigma.com/bhagavata.html 12030521 ಕೃತೇ ಯದ್ಧ್ಯಾಯತೋ ವಿಷ್ಣುಂ ತ್ರೇತಾಯಾಂ ಯಜತೋ ಮಖೈಃ 12030523 ದ್ವಾಪರೇ ಪರಿಚರ್ಯಾಯಾಂ ಕಲೌ ತದ್ಧರಿಕೀರ್ತನಾತ್ 12030521 kṛte yaddhyāyato viṣṇuṃ tretāyāṃ yajato makhaiḥ 12030523 dvāpare paricaryāyāṃ kalau taddharikīrtanāt
Pravachana by Padmashree Dr. Bannanje Govinda Acharya at SKV, Edison, NJ, USA on Mar 11, 2017
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