Bhagavad Gita 18.65
Dedicate yourself to Me, worship Me, sacrifice all for Me, prostrate yourself before Me, and you will surely come to Me. I truly pledge to you; you are My beloved.
मन्मना भव मद्भक्तो मद्याजी मां नमस्कुरु।मामेवैष्यसि सत्यं ते प्रतिजाने प्रियोऽसि मे॥manmanā bhava madbhakto madyājī māṃ namaskuru|māmevaiṣyasi satyaṃ te pratijāne priyo'si me||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).