Bhagavad Gita 4.8
परित्राणाय साधूनां विनाशाय च दुष्कृताम्।
धर्मसंस्थापनार्थाय संभवामि युगे युगे।।4.8।।
Paritranaya sadhunam vinashaya cha dushkritam
Dharmasansthapanarthaya sambhavami yuge yuge
Simple meaning, written by AIHe appears in every age to protect the good, destroy the wicked and re‑establish dharma.