SB 6.3.18
bhutani visnoh sura-pujitani
durdarsa-lingani mahadbhutani
raksanti tad-bhaktimatah parebhyo
mattas ca martyan atha sarvatas ca
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The order carriers of Lord Visnu, who are worshiped even by the demigods, possess wonderful bodily features exactly like those of Visnu and are very rarely seen. The Visnudutas protect the devotees of the Lord from the hands of enemies, from envious persons and even from my jurisdiction, as well as from natural disturbances.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Yamaraja has specifically described the qualities of the Visnudutas to convince his own servants not to be envious of them. Yamaraja warned the Yamadutas that the Visnudutas are worshiped with respectful obeisances by the demigods and are always very alert to protect the devotees of the Lord from the hands of enemies, from natural disturbances and from all dangerous conditions in this material world. Sometimes the members of the Krsna Consciousness Society are afraid of the impending danger of world war and ask what would happen to them if a war should occur. In all kinds of danger, they should be confident of their protection by the Visnudutas or the Supreme Personality of Godhead, as confirmed in Bhagavad-gita (kaunteya pratijanihi na me bhaktah pranasyati). Material danger is not meant for devotees. This is also confirmed in Srimad-Bhagavatam. Padam padam yad vipadam na tesam: in this material world there are dangers at every step, but they are not meant for devotees who have fully surrendered unto the lotus feet of the Lord. The pure devotees of Lord Visnu may rest assured of the Lord’s protection, and as long as they are in this material world they should fully engage in devotional service by preaching the cult of Sri Caitanya Mahaprabhu and Lord Krsna, namely the Hare Krsna movement of Krsna consciousness.