Srimad Bhagavatam Canto 06, Chapter 01, Text 19

SB 6.1.19

sakrn manah krsna-padaravindayor
 nivesitam tad-guna-ragi yair iha
na te yamam pasa-bhrtas ca tad-bhatan
 svapne ’pi pasyanti hi cirna-niskrtah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Although not having fully realized Krsna, persons who have even once surrendered completely unto His lotus feet and who have become attracted to His name, form, qualities and pastimes are completely freed of all sinful reactions, for they have thus accepted the true method of atonement. Even in dreams, such surrendered souls do not see Yamaraja or his order carriers, who are equipped with ropes to bind the sinful.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Krsna says in Bhagavad-gita (18.66):
sarva-dharman parityajya
 mam ekam saranam vraja
aham tvam sarva-papebhyo
 moksayisyami ma sucah
“Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reaction. Do not fear.” This same principle is described here (sakrn manah krsna-padaravindayoh). If by studying Bhagavad-gita one decides to surrender to Krsna, he is immediately freed from all sinful reactions. It is also significant that Sukadeva Gosvami, having several times repeated the words vasudeva-parayana and narayana-parayana, finally says krsna-padaravindayoh. Thus he indicates that Krsna is the origin of both Narayana and Vasudeva. Even though Narayana and Vasudeva are not different from Krsna, simply by surrendering to Krsna one fully surrenders to all His expansions, such as Narayana, Vasudeva and Govinda. As Krsna says in Bhagavad-gita (7.7), mattah parataram nanyat: “There is no truth superior to Me.” There are many names and forms of the Supreme Personality of Godhead, but Krsna is the supreme form (krsnas tu bhagavan svayam). Therefore Krsna recommends to neophyte devotees that one should surrender unto Him only (mam ekam). Because neophyte devotees cannot understand what the forms of Narayana, Vasudeva and Govinda are, Krsna directly says, mam ekam. Herein, this is also supported by the word krsna-padaravindayoh. Narayana does not speak personally, but Krsna, or Vasudeva, does, as in Bhagavad-gita for example. Therefore, to follow the direction of Bhagavad-gita means to surrender unto Krsna, and to surrender in this way is the highest perfection of bhakti-yoga.
Pariksit Maharaja had inquired from Sukadeva Gosvami how one can be saved from falling into the various conditions of hellish life. In this verse Sukadeva Gosvami answers that a soul who has surrendered to Krsna certainly cannot go to naraka, hellish existence. To say nothing of going there, even in his dreams he does not see Yamaraja or his order carriers, who are able to take one there. In other words, if one wants to save himself from falling into naraka, hellish life, he should fully surrender to Krsna. The word sakrt is significant because it indicates that if one sincerely surrenders to Krsna once, he is saved even if by chance he falls down by committing sinful activities. Therefore Krsna says in Bhagavad-gita (9.30):
api cet su-duracaro
 bhajate mam ananya-bhak
sadhur eva sa mantavyah
 samyag vyavasito hi sah
“Even if one commits the most abominable actions, if he is engaged in devotional service he is to be considered saintly because he is properly situated.” If one never for a moment forgets Krsna, he is safe even if by chance he falls down by committing sinful acts.
In the Second Chapter of Bhagavad-gita (2.40) the Lord also says:
nehabhikrama-naso ’sti
 pratyavayo na vidyate
svalpam apy asya dharmasya
 trayate mahato bhayat
“In this endeavor there is no loss or diminution, and a little advancement on this path can protect one from the most dangerous type of fear.”
Elsewhere in the Gita (6.40) the Lord says, na hi kalyana-krt kascid durgatim tata gacchati: “one who performs auspicious activity is never overcome by evil.” The highest kalyana (auspicious) activity is to surrender to Krsna. That is the only path by which to save oneself from falling down into hellish life. Srila Prabodhananda Sarasvati has confirmed this as follows:
kaivalyam narakayate tri-dasa-pur akasa-puspayate
 durdantendriya-kala-sarpa-patali protkhata-damstrayate
visvam purna-sukhayate vidhi-mahendradis ca kitayate
 yat-karunya-kataksa-vaibhavavatam tam gauram eva stumah
(Caitanya-candramrta 5)
The sinful actions of one who has surrendered unto Krsna are compared to a snake with its poison fangs removed (protkhata-damstrayate). Such a snake is no longer to be feared. Of course, one should not commit sinful activities on the strength of having surrendered to Krsna. However, even if one who has surrendered to Krsna happens to do something sinful because of his former habits, such sinful actions no longer have a destructive effect. Therefore one should adhere to the lotus feet of Krsna very tightly and serve Him under the direction of the spiritual master. Thus in all conditions one will be akuto-bhaya, free from fear.
Srimad Bhagavatam Canto 06, Chapter 01, Text 18
Srimad Bhagavatam Canto 06, Chapter 01, Text 20