Bhagavad Gita · 12.8

मय्येव मन आधत्स्व मयि बुद्धिं निवेशय।निवसिष्यसि मय्येव अत ऊर्ध्वं न संशयः॥

mayy eva mana ādhatsva mayi buddhiṁ niveśhaya nivasiṣhyasi mayy eva ata ūrdhvaṁ na sanśhayaḥ

Fix your mind on me alone, place your intellect in me. You shall then dwell in me alone — of this there is no doubt.

— Bhagavad Gita 12.8

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