Kaṭha Upaniṣad 6.5

6.5

yathādarśe tathātmani yathā svapne tathā pitṛloke /
yathāpsu parīva dadṛśe tathā gandharvaloke chāyātapayor iva brahmaloke //

4. If one has been able to perceive [Him] here on earth
Before the dissolution of the body,
According to that [knowledge] he becomes fitted
For embodiment in the world-creations.
5. As in a mirror, so is it seen in the body (ātman);
As in a dream, so in the world of the fathers;
As if in water, so in the world of the Gandharvas (genii);
As if in light and shade, so in the world of Brahma.