Śrīmad-Bhāgavatam · Text 10.18.26
Who is speaking and story frame
तमुद्वहन् धरणिधरेन्द्रगौरवं
महासुरो विगतरयो निजं वपु: ।
स आस्थित: पुरटपरिच्छदो बभौ
तडिद्द्युमानुडुपतिवाडिवाम्बुद: ॥ २६ ॥
tam udvahan dharaṇi-dharendra-gauravaṁ
mahāsuro vigata-rayo nijaṁ vapuḥ
sa āsthitaḥ puraṭa-paricchado babhau
taḍid-dyumān uḍupati-vāḍ ivāmbudaḥ
As the great demon carried Balarāma, the Lord became as heavy as massive Mount Sumeru, and Pralamba had to slow down. He then resumed his actual form — an effulgent body that was covered with golden ornaments and that resembled a cloud flashing with lightning and carrying the moon.
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.