To a grieving heart Krishna speaks the oldest comfort: what you truly loved in them was never the kind of thing that can die.
न जायते म्रियते वा कदाचि न्नायं भूत्वा भविता वा न भूयः। अजो नित्यः शाश्वतोऽयं पुराणो न हन्यते हन्यमाने शरीरे।।2.20।।
na jāyate mriyate vā kadāchin nāyaṁ bhūtvā bhavitā vā na bhūyaḥ ajo nityaḥ śhāśhvato ’yaṁ purāṇo na hanyate hanyamāne śharīre
This is never born, nor does It die. It is not that not having been It again comes into being. (Or according to another view: It is not that having been It again ceases to be). This is unborn, eternal, changeless, ever-Itself. It is not killed when the body is killed.
— Swami Swarupananda