Don't feed dead people. - Deuteronomy 26:14

Deuteronomy 26 is nice and short, and like the other chapters it's a list of arbitrary rules.  Here's basically what it says:

1. Give the first fruit of your crops to Yahweh (actually the priesthood).  The justification for this: Yahweh brought them out of Egypt.
2. Every three years, give more to the poor, the strangers, the priesthood, orphans, and widows.
3. Don't eat while in mourning, don't eat for unclean reasons, and don't offer food for the dead.