Nanda Maharaja is so great that the Parabrahman is crawling in his yard, and therefore I (Brahma) shall worship him - Padyavali 126

Expressions researched:
"Nanda Mahārāja is so great that the Parabrahman is crawling in his yard, and therefore I shall worship him"

Srimad-Bhagavatam

SB Canto 10.1 to 10.13

"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).

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.