SB 9.9.11
rathena vayu-vegena
prayantam anudhavati
desan punanti nirdagdhan
asiñcat sagaratmajan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Bhagiratha mounted a swift chariot and drove before mother Ganges, who followed him, purifying many countries, until they reached the ashes of Bhagiratha’s forefathers, the sons of Sagara, who were thus sprinkled with water from the Ganges.