Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 2
दिलीपस्तत्सुतस्तद्वदशक्त: कालमेयिवान् ।भगीरथस्तस्य सुतस्तेपे स सुमहत् तप: ॥ २ ॥
dilīpas tat-sutas tadvadaśaktaḥ kālam eyivānbhagīrathas tasya sutastepe sa sumahat tapaḥ
Like Aṁśumān himself, Dilīpa, his son, was unable to bring the Ganges to this material world, and he also became a victim of death in due course of time. Then Dilīpa’s son, Bhagīratha, performed very severe austerities to bring the Ganges to this material world.