Bhagavad Gita · 18.55

भक्त्या मामभिजानाति यावान्यश्चास्मि तत्त्वतः।ततो मां तत्त्वतो ज्ञात्वा विशते तदनन्तरम्॥

bhaktyā mām abhijānāti yāvān yaśh chāsmi tattvataḥ tato māṁ tattvato jñātvā viśhate tad-anantaram

Through devotion one comes to know Me — what and who I am in truth. Then, having known Me in truth, one enters into Me immediately.

— Bhagavad Gita 18.55

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)