सकृदेव प्रपन्नाय तवास्मीति च याचते।
अभयं सर्वभूतेभ्यः ददाम्येतत् व्रतं मम ॥६.१८.३३॥
When Sugriva cautions Rama against a ready acceptance of Vibhishana's request for refuge, Rama first asks everyone for an opinion, and only Hanuman suggests that Vibhishana cannot be spurned or tested in the circumstances and he should first be given refuge and also Hanuman says yhat in any case Rama is too powerful to come to any harm.
Rama appreciates what Hanuman says and utters these words in this shloka:
एतत् व्रतं मम - This is my avowed practice that
सकृदेव - if even once,
तव अस्मि इति - "I surrender to you" -thus saying,
प्रपन्नाय याचते च - one comes seeking refuge and with a plea for protection,
सर्वभूतेभ्यः - from the entire world of beings,
अभयं ददामि - I shall give protection and remove his fear.
This very idea is reflected in the name name #455 in Vishnu Sahasranama - सुव्रतः. In fact the Lord says in Bhagavadgita ch. 9 that even a sinner, by turning to the Lord, quickly redeems himself.
