Śrīmad-Bhāgavatam · Text 5.10.15
Who is speaking and story frame
स चापि पाण्डवेय सिन्धुसौवीरपतिस्तत्त्वजिज्ञासायां सम्यक्श्रद्धयाधिकृताधिकारस्तद्धृदयग्रन्थिमोचनं द्विजवच आश्रुत्य बहुयोगग्रन्थसम्मतं त्वरयावरुह्य शिरसा पादमूलमुपसृत: क्षमापयन् विगतनृपदेवस्मय उवाच ॥ १५ ॥
sa cāpi pāṇḍaveya sindhu-sauvīra-patis tattva-jijñāsāyāṁ samyak-śraddhayādhikṛtādhikāras tad dhṛdaya-granthi-mocanaṁ dvija-vaca āśrutya bahu-yoga-grantha-sammataṁ tvarayāvaruhya śirasā pāda-mūlam upasṛtaḥ kṣamāpayan vigata-nṛpa-deva-smaya uvāca.
Śukadeva Gosvāmī continued: O best of the Pāṇḍu dynasty [Mahārāja Parīkṣit], the King of the Sindhu and Sauvīra states [Mahārāja Rahūgaṇa] had great faith in discussions of the Absolute Truth. Being thus qualified, he heard from Jaḍa Bharata that philosophical presentation which is approved by all scriptures on the mystic yoga process and which slackens the knot in the heart. His material conception of himself as a king was thus destroyed. He immediately descended from his palanquin and fell flat on the ground with his head at the lotus feet of Jaḍa Bharata in such a way that he might be excused for his insulting words against the great brāhmaṇa. He then prayed as follows.
Read Śrīla Prabhupāda's purport on Vedabase.io