Vaishnava Samhita. Narasimha Mehta Charitam I. Vol III Book VI Chp 15 Shlokas 52 - 54

बाष्पपूरितनेत्राणां कृष्णकीर्तनकारिणाम् |
पावितं भुवनं सर्वं भक्तानां पादरेणुभिः ||
विश्वेश्वरस्तथा काश्यां कैलासे तु महेश्वरः |
गोपेश्वरः श्रीवने च श्रीशैले परमेश्वरः ||
एवं प्रदोषकाले तु स्मरन्नीशचत्तुष्टयम् |
शिवसायुज्यमाप्नोति संसाराब्धिसमुत्थितः ||   

The world gets sanctified with the sacred dust of the holy feet of those bhagavatas who sing in praise of Shri Krishna, eyes shedding tears of ecstasy. If an individual meditates upon the four forms of Easwara viz. Shri Vishveshwara in Kashi, Shri Maheswara in Kailasha, Shri Gopishwara in Brindavan and Shri Parameshwara in Shrishailam, at the time of pradosha, he can get ashore the ocean of samsara and reach the final abode of Shri Shiva (Shivasayuja)

Thus ends Chapter Fifteen entitled 'Narasimha Mehta Charitam I' of Book VI of Shri Vaishnava Samhita composed by Shri Shri Krishna Premi Swamigal