sa ekadā tu mṛgayāṁ
vicaran vijane vane
yadṛcchayāśrama-padaṁ
jamadagner upāviśat
saḥ - he, Kārtavīryārjuna; ekadā - once upon a time; tu - but; mṛgayām - while hunting; vicaran - wandering; vijane - solitary; vane - in a forest; yadṛcchayā - without any program; āśrama-padam - the residential place; jamadagneḥ - of Jamadagni Muni; upāviśat - he entered.
Kārtavīryārjuna had no business going to the residence of Jamadagni, but because he was puffed-up by his extraordinary power, he went there and offended Paraśurāma. This was the prelude to his being killed by Paraśurāma for his offensive act.