According to Hebrews 11:17, Abraham's faith was tested when God told him to offer his son Isaac as a burnt offering (a sacrifice).
(Vaheveru 11:17) Mukambisisi un'wana u te: "Eka Xikwembu, ndlela leyi Abrahama a a tiyimisele ha yona ku nyikela hi n'wana wakwe a swi fana ni loko se a nyikerile ha yena."