Bhagavadgita The Song Divine Chapter 2 (stanza 13-24)

Just as boyhood, youth and old age are attributed to the soul through this body, even so it attains another body. The wise man does not get deluded about this. ……… (13)

O son of Kunti, the contacts between the senses and their objects, which give rise to the feelings of heat and cold, pleasure and pain etc, are transitory and feeling; therefore, Arjun, endure them. …… (14)

Arjun, the wise man to whom pain and pleasure are alike, and who is not tormented by these contacts  becomes eligible for immortality………… (15)

The unreal has no existence, and the real never ceases to be; the reality of both has thus been perceived by the seers of Truth. …………….. (16)

Know that alone to be imperishable which pervades this universe; for no one has power to destroy this indestructible substance. …………….. (17)

All these bodies pertaining to the imperishable indefinable and eternal soul are spoken of as perishable; therefore, Arjun, fight. ………… (18)

The soul is never born, nor it ever dies, nor does it become after being born. For, it is unborn, eternal, everlasting and primeval; even though the body is slain, the soul is not. … (20)

Arjun, the man who knows this soul to be imperishable; eternal and free from birth and decay - how and whom will he cause to be killed, how and whom will he kill? …. (21)

As a man shedding worn-out garments, takes other new ones, likewise, the embodied soul, casting off worn-out bodies, enters into others that are new. ---------------- (22)

Weapons cannot cut it nor can fire burn it; water cannot wet it nor can wind dry it. …. (23)

For this soul is incapable of being cut, or burnt by fire; nor can it be dissolved by water and is undriable by air as well: This soul is eternal, all pervading, immovable, constant and everlasting. ……………… (24)