Śrīmad-Bhāgavatam · Text 7.9.5
Who is speaking and story frame
स्वपादमूले पतितं तमर्भकं
विलोक्य देव: कृपया परिप्लुत: ।
उत्थाप्य तच्छीर्ष्ण्यदधात्कराम्बुजं
कालाहिवित्रस्तधियां कृताभयम् ॥ ५ ॥
sva-pāda-mūle patitaṁ tam arbhakaṁ
vilokya devaḥ kṛpayā pariplutaḥ
utthāpya tac-chīrṣṇy adadhāt karāmbujaṁ
kālāhi-vitrasta-dhiyāṁ kṛtābhayam
When Lord Nṛsiṁhadeva saw the small boy Prahlāda Mahārāja prostrated at the soles of His lotus feet, He became most ecstatic in affection toward His devotee. Raising Prahlāda, the Lord placed His lotus hand upon the boy’s head because His hand is always ready to create fearlessness in all of His devotees.
Read Śrīla Prabhupāda's purport on Vedabase.io