With a faltering voice he (Brahma) offered prayers, understanding that here was the Supreme Person

Expressions researched:
"with a faltering voice he offered prayers, understanding that here was the Supreme Person"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

Brahmā was falling down in ecstasy. Because of the presence of the Supreme Personality of Godhead, who exactly resembled a human child, Brahmā was naturally astonished. Therefore with a faltering voice he offered prayers, understanding that here was the Supreme Person.

SB 10.13.63, Translation and Purport

Rising and falling again and again at the lotus feet of Lord Kṛṣṇa for a long time, Lord Brahmā remembered over and over the Lord's greatness he had just seen.

As stated in one prayer,

śrutim apare smṛtim itare bhāratam anye bhajantu bhava-bhītāḥ

aham iha nandaṁ vande yasyālinde paraṁ brahma

"Let others study the Vedas, smṛti and Mahābhārata, fearing material existence, but I shall worship Nanda Mahārāja, in whose courtyard is crawling the Supreme Brahman. Nanda Mahārāja is so great that the Parabrahman is crawling in his yard, and therefore I shall worship him." (Padyāvalī 126)

Brahmā was falling down in ecstasy. Because of the presence of the Supreme Personality of Godhead, who exactly resembled a human child, Brahmā was naturally astonished. Therefore with a faltering voice he offered prayers, understanding that here was the Supreme Person.