Śrīmad-Bhāgavatam · Text 7.4.36
Who is speaking and story frame
गुणैरलमसङ्ख्येयैर्माहात्म्यं तस्य सूच्यते ।
वासुदेवे भगवति यस्य नैसर्गिकी रति: ॥ ३६ ॥
guṇair alam asaṅkhyeyair
māhātmyaṁ tasya sūcyate
vāsudeve bhagavati
yasya naisargikī ratiḥ
Who could list the innumerable transcendental qualities of Prahlāda Mahārāja? He had unflinching faith in Vāsudeva, Lord Kṛṣṇa [the son of Vasudeva], and unalloyed devotion to Him. His attachment to Lord Kṛṣṇa was natural because of his previous devotional service. Although his good qualities cannot be enumerated, they prove that he was a great soul [mahātmā].
Read Śrīla Prabhupāda's purport on Vedabase.io