Srimad Bhagavatam Canto 09, Chapter 09, Text 06

SB 9.9.6

sri-bhagiratha uvaca
sadhavo nyasinah santa
 brahmistha loka-pavanah
haranty agham te ’nga-sangat
 tesv aste hy agha-bhid dharih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Bhagiratha said: Those who are saintly because of devotional service and are therefore in the renounced order, free from material desires, and who are pure devotees, expert in following the regulative principles mentioned in the Vedas, are always glorious and pure in behavior and are able to deliver all fallen souls. When such pure devotees bathe in your water, the sinful reactions accumulated from other people will certainly be counteracted, for such devotees always keep in the core of their hearts the Supreme Personality of Godhead, who can vanquish all sinful reactions.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Mother Ganges is available to everyone for bathing. Therefore, not only will sinful persons bathe in the Ganges water, but in Hardwar and other holy places where the Ganges flows, saintly persons and devotees will also bathe in the waters of the Ganges. Devotees and saintly persons advanced in the renounced order can deliver even the Ganges. Tirthi-kurvanti tirthani svantah-sthena gadabhrta (Bhag. 1.13.10). Because saintly devotees always keep the Lord within the core of their hearts, they can perfectly cleanse the holy places of all sinful reactions. Therefore, people in general must always respectfully honor saintly persons. It is ordered that as soon as one sees a Vaisnava, or even a sannyasi, one should immediately offer respects to such a holy man. If one forgets to show respect in this way, one must observe a fast for that day. This is a Vedic injunction. One must be extremely careful to refrain from committing offenses at the lotus feet of a devotee or saintly person.
 
There are methods of prayascitta, or atonement, but they are inadequate to cleanse one of sinful reactions. One can be cleansed of sinful reactions only by devotional service, as stated in regard to the history of Ajamila:
 
kecit kevalaya bhaktya
 vasudeva-parayanah
agham dhunvanti kartsnyena
 niharam iva bhaskarah
 
“Only a rare person who has adopted complete, unalloyed devotional service to Krsna can uproot the weeds of sinful actions with no possibility that they will revive. He can do this simply by discharging devotional service, just as the sun can immediately dissipate fog by its rays.” (Bhag. 6.1.15) If one is under the protection of a devotee and sincerely renders service unto him, by this process of bhakti-yoga one is certainly able to counteract all sinful reactions.
Srimad Bhagavatam Canto 09, Chapter 09, Text 05
Srimad Bhagavatam Canto 09, Chapter 09, Text 07