Deuteronomy 21:16
when the time comes for the man to decide what each son will inherit from him, he must not prefer the son of wife he loves and treat him as the firstborn instead of the son of the wife he doesn't love.when the time comes for the man to decide what each son will inherit from him, he must not prefer the son of wife he loves and treat him as the firstborn instead of the son of the wife he doesn't love.