The great and saintly king Bhagīratha brought the Ganges, which can deliver all the fallen souls, to that place on earth where the bodies of his forefathers lay burnt to ashes.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भगीरथः स राजर्षिर्निन्ये भुवनपावनीम् । यत्र स्वपितॄणां देहा भस्मीभूताः स्म शेरते
bhagīrathaḥ sa rājarṣirninye bhuvanapāvanīm | yatra svapitṝṇāṃ dehā bhasmībhūtāḥ sma śerate
SB 9.9.10