The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c9.s2.t4.3

c9.s2.t4.3

“—After they have dwelt there, so long as any residuum is left, they return by the way they came, back again into the Âkâça, from the Âkâça into the wind; after they have become wind, they become smoke, after becoming smoke, vapour, after becoming vapour, cloud, after becoming cloud, they descend as rain; these same are born here below as rice and barley, as herbs and trees, as sesame and beans. Thence truly it is more difficult to escape; for only the man who eats him as food, who emits him as seed, only his increase (descendant) does he become.—(The following down to the end only in Chând.) Now those whose conduct here was fair, for them there is the prospect that they will come into a fair womb, the womb of a Brahman, or a Kshatriya or a Vaiçya;—those, however, whose conduct here was foul, for them there is the prospect that they will come into a foul womb, a dog's womb, a swine's womb, or (even) into the womb of a Caṇḍâla,”