SB 8.23.6
sri-prahrada uvaca
nemam viriñco labhate prasadam
na srir na sarvah kim utapare ’nye
yan no ’suranam asi durga-palo
visvabhivandyair abhivanditanghrih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Prahlada Maharaja said: O Supreme Personality of Godhead, You are universally worshiped; even Lord Brahma and Lord Siva worship Your lotus feet. Yet although You are such a great personality, You have kindly promised to protect us, the demons. I think that such kindness has never been achieved even by Lord Brahma, Lord Siva or the goddess of fortune, Laksmi, what to speak of other demigods or common people.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The word durga-pala is significant. The word durga means “that which does not go very easily.” Generally durga refers to a fort, which one cannot very easily enter. Another meaning of durga is “difficulty.” Because the Supreme Personality of Godhead promised to protect Bali Maharaja and his associates from all dangers, He is addressed here as durga-pala, the Lord who gives protection from all miserable conditions.