Bhagavad Gita 18.55
By such devotion, he sees Me, who I am and what I am; and thus realizing the truth, he enters into My kingdom.
भक्त्या मामभिजानाति यावान्यश्चास्मि तत्त्वतः।ततो मां तत्त्वतो ज्ञात्वा विशते तदनन्तरम्॥bhaktyā māmabhijānāti yāvānyaścāsmi tattvataḥ|tato māṃ tattvato jñātvā viśate tadanantaram||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).