Bhagavad Gita 2.13

देहिनोऽस्मिन्यथा देहे कुमारं यौवनं जरा |
तथा देहान्तरप्राप्तिर्धीरस्तत्र न मुह्यति

Translation

Just as the embodied soul continuously passes from childhood to youth to old age, similarly, at the time of death, the soul passes into another body. The wise are not deluded by this.