Vaishnava Samhita. Narasimha Mehta Charitam I. Vol III Book VI Chp 15 Shlokas 19 - 20

श्रीसद्गुरुरुवाच 
इमं स्तवं पठन्नित्यं नरसिह्मः शिवालये |
विनिद्रो वायुभक्षश्च चक्रे भक्तिं महेश्वरे ||
तस्य भक्त्या प्रह्रष्टात्मा भगवान् वृषभध्वजः |
मुनीनां दुर्लभश्चापि कृपया दर्शनं ददौ  ||

Shri Sadguru said

Chanting the same verses again and again Narasimha Mehta stayed in that Shiva temple and prayed to Lord Shiva giving up food and sleep. Pleased with his firm devotion Lord Shiva gave him darshan, which is impossible to get even for the saints.