Verse 9.31
क्षिप्रं भवति धर्मात्मा शश्वच्छान्तिं निगच्छति। कौन्तेय प्रतिजानीहि न मे भक्तः प्रणश्यति।।9.31।।
kṣhipraṁ bhavati dharmātmā śhaśhvach-chhāntiṁ nigachchhati kaunteya pratijānīhi na me bhaktaḥ praṇaśhyati
Meaning
Yo, Arjuna, my devotee becomes righteous real quick and achieves eternal chill. I'm telling you straight up, they ain't ever perishing.
Commentary
No cap, Arjuna, this is the tea: My devotee—the one who's 100% down with me, who's given me their all—never, ever dies. Bet.