Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 10
Sanskrit:
एकदाश्रमतो रामे सभ्रातरि वनं गते ।वैरं सिषाधयिषवो लब्धच्छिद्रा उपागमन् ॥ १० ॥
ITRANS:
ekadāśramato rāmesabhrātari vanaṁ gatevairaṁ siṣādhayiṣavolabdha-cchidrā upāgaman
Translation:
Once when Paraśurāma left the āśrama for the forest with Vasumān and his other brothers, the sons of Kārtavīryārjuna took the opportunity to approach Jamadagni’s residence to seek vengeance for their grudge.