परित्राणाय साधूनां विनाशाय च दुष्कृताम्।
धर्मसंस्थापनार्थाय सम्भवामि युगे युगे॥
paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām · dharma-saṁsthāpanārthāya sambhavāmi yuge yuge
To protect the good, to destroy the wicked, and to re-establish dharma — I take birth in every age.
भगवद्गीता ४.८