EXOD800 Biblical consideration for animals was the basis for the following laws: … A passer-by who comes across a fallen beast of burden, which is unable to rise due to its heavy load, must stop to help unload the burden [this verse]. The Talmud bases this injunction on the broad principle of prevention of pain to animals (tzaar baalei chaim; Baba Metzia 32b). Medical research on animals was exempted by the medieval rabbis from the restrictions of this principle (Rema, Even HoEzer 5:14). Hunting as a sport, not for the purpose of procurement of food, is considered cruel and sinful (Avodah Zarah 18b).