SB 10.8.18
ya etasmin maha-bhagah
pritim kurvanti manavah
narayo ’bhibhavanty etan
visnu-paksan ivasurah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Demons [asuras] cannot harm the demigods, who always have Lord Visnu on their side. Similarly, any person or group attached to Krsna is extremely fortunate. Because such persons are very much affectionate toward Krsna, they cannot be defeated by demons like the associates of Kamsa [or by the internal enemies, the senses].