Prahlāda Mahārāja fixed his mind and sight upon Lord Nṛsiṁhadeva with full attention in complete trance. With a fixed mind, he began to offer prayers in love with a faltering voice.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अस्तौषीद्धरिमेकाग्रमनसा सुसमाहितः । प्रेमगद्गदया वाचा तन्न्यस्तहृदयेक्षणः
astauṣīddharimekāgramanasā susamāhitaḥ | premagadgadayā vācā tannyastahṛdayekṣaṇaḥ
SB 7.9.7