Śrīmad-Bhāgavatam · Text 10.56.22
Who is speaking and story frame
स वै भगवता तेन युयुधे स्वामिनात्मन: ।
पुरुषं प्राकृतं मत्वा कुपितो नानुभाववित् ॥ २२ ॥
sa vai bhagavatā tena
yuyudhe svāmīnātmanaḥ
puruṣam prākṛtaṁ matvā
kupito nānubhāva-vit
Unaware of His true position and thinking Him an ordinary man, Jāmbavān angrily began fighting with the Supreme Lord, his master.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.