Śrīmad-Bhāgavatam · Text 9.16.6
Who is speaking and story frame
राम: सञ्चोदित: पित्रा भ्रातृन् मात्रा सहावधीत् ।
प्रभावज्ञो मुने: सम्यक् समाधेस्तपसश्च स: ॥ ६ ॥
rāmaḥ sañcoditaḥ pitrā
bhrātṝn mātrā sahāvadhīt
prabhāva-jño muneḥ samyak
samādhes tapasaś ca saḥ
Jamadagni then ordered his youngest son, Paraśurāma, to kill his brothers, who had disobeyed this order, and his mother, who had mentally committed adultery. Lord Paraśurāma, knowing the power of his father, who was practiced in meditation and austerity, killed his mother and brothers immediately.
Read Śrīla Prabhupāda's purport on Vedabase.io