Śrīmad-Bhāgavatam · Text 1.18.49
Who is speaking and story frame
इति पुत्रकृताघेन सोऽनुतप्तो महामुनि: ।
स्वयं विप्रकृतो राज्ञा नैवाघं तदचिन्तयत् ॥ ४९ ॥
iti putra-kṛtāghena
so ’nutapto mahā-muniḥ
svayaṁ viprakṛto rājñā
naivāghaṁ tad acintayat
The sage thus regretted the sin committed by his own son. He did not take the insult paid by the King very seriously.
Read Śrīla Prabhupāda's purport on Vedabase.io