Srimad Bhagavatam Canto 06, Chapter 03, Text 23

SB 6.3.23

namoccarana-mahatmyam
 hareh pasyata putrakah
ajamilo ’pi yenaiva
 mrtyu-pasad amucyata
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
My dear servants, who are as good as my sons, just see how glorious is the chanting of the holy name of the Lord. The greatly sinful Ajamila chanted only to call his son, not knowing that he was chanting the Lord’s holy name. Nevertheless, by chanting the holy name of the Lord, he remembered Narayana, and thus he was immediately saved from the ropes of death.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
There is no need to conduct research into the significance of the chanting of the Hare Krsna mantra. The history of Ajamila is sufficient proof of the power of the Lord’s holy name and the exalted position of a person who chants the holy name incessantly. Therefore Sri Caitanya Mahaprabhu advised:
 
harer nama harer nama
 harer namaiva kevalam
kalau nasty eva nasty eva
 nasty eva gatir anyatha
 
In this Age of Kali, no one can perform all the ritualistic ceremonies for becoming liberated; that is extremely difficult. Therefore all the sastras and all the acaryas have recommended that in this age one chant the holy name.
Srimad Bhagavatam Canto 06, Chapter 03, Text 22
Srimad Bhagavatam Canto 06, Chapter 03, Text 24