One verse

Srimad Bhagavatam 9.7.7

9.7.7

त्रैशङ्कवो हरिश्चन्द्रो विश्वामित्रवसिष्ठयो: । यन्निमित्तमभूद् युद्धं पक्षिणोर्बहुवार्षिकम् ॥ ७ ॥

traisankavo hariscandro visvamitra-vasisthayoh yan-nimittam abhud yuddham paksinor bahu-varsikam

traisankavah
the son of Trisanku
hariscandrah
by the name Hariscandra
visvamitra-vasisthayoh
between Visvamitra and Vasistha
yat-nimittam
because of Hariscandra
abhut
there was
yuddham
a great fight
paksinoh
both of whom had been converted into birds
bahu-varsikam
for many years.

The son of Trisanku was Hariscandra. Because of Hariscandra there was a quarrel between Visvamitra and Vasistha, who for many years fought one another, having been transformed into birds.