BG 4.8
परित्राणाय साधूनां विनाशाय च दुष्कृताम्। धर्मसंस्थापनार्थाय संभवामि युगे युगे
paritrāṇāya sādhūnāṁ vināśhāya cha duṣhkṛitām dharma-sansthāpanārthāya sambhavāmi yuge yuge
To protect the righteous, to destroy the wicked, and to establish the kingdom of God, I am reborn from age to age.
Translated by Shri Purohit Swami
For the protection of the good, for the destruction of the wicked, and for the establishment of righteousness, I am born in every age.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
paritrāṇāya—to protect; sādhūnām—the righteous; vināśhāya—to annihilate; cha—and; duṣhkṛitām—the wicked; dharma—the eternal religion; sansthāpana-arthāya—to reestablish; sambhavāmi—I appear; yuge yuge—age after age