One verse

Srimad Bhagavatam 10.71.3

10.71.3

यष्टव्यं राजसूयेन दिक्च‍क्रजयिना विभो । अतो जरासुतजय उभयार्थो मतो मम ॥ ३ ॥

yaṣṭavyam rājasūyena dik-cakra-jayinā vibho ato jarā-suta-jaya ubhayārtho mato mama

yaṣṭavyam
sacrifice should be performed
rājasūyena
with the Rājasūya ritual
dik
of directions
cakra
the complete circle
jayinā
by one who has conquered
vibho
O almighty one
ataḥ
therefore
jarā-suta
of the son of Jarā
jayaḥ
the conquest
ubhaya
both
arthaḥ
having the purposes
mataḥ
opinion
mama
my

Only one who has conquered all opponents in every direction can perform the Rājasūya sacrifice, O almighty one. Thus, in my opinion, conquering Jarāsandha will serve both purposes.