Chapter 4 · verse 8 · gita.yoga.org

Bhagavad Gita 4.8

परित्राणाय साधूनां विनाशाय च दुष्कृताम्। धर्मसंस्थापनार्थाय संभवामि युगे युगे

For the protection of the good, for the destruction of the wicked, and for the establishment of righteousness, I am born in every age.