Caste

1. If any S'ûdra dies performing his own religion, he takes up a Vais’ya body in his next incarnation; 
2. if any Vais'ya died so, he takes up a Ksattriya body and 
3. a Ksattriya when adhering to his own rites and ceremonies, dying takes up a Brâhman body in his next incarnation. And 
4. if a Brâhmin be free from desires and resorts to the path of peace, when he dies, he becomes free from incarnations and is saved from this disease of getting into the world.

https://www.sacred-texts.com/hin/db/bk04ch01.htm

https://freeglobaluniversity.blogspot.com/search/label/CasteLanguageReligion