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

Place thy mind in me, into Me let thy Reason enter; then without doubt thou shalt abide in Me hereafter.

In plain words: Krishna tells Arjuna to put his mind and his understanding fully on him. Then he will surely live in Krishna afterward.