Bhagavad Gita 4.8

परित्राणाय साधूनां विनाशाय च दुष्कृताम्।धर्मसंस्थापनार्थाय संभवामि युगे युगे ॥४.८॥

paritrāṇāya sādhūnāṃ vināśāya ca duṣkṛtāmdharmasaṃsthāpanārthāya saṃbhavāmi yuge yuge

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

गीता