Once you've dedicated something to God, don't take it back, even if you think God doesn't care about it. He does. Leviticus 19:5-8

Be generous with the poor and indigent, but don't tolerate able-bodied leeches. God's welfare plan doesn't include a direct deposit option. Leviticus 19:9-10

Don't cheat or manipulate each other. Such behavior doesn't belong in God's house. To cheat a brother is to cheat the very image of God. If you love God, then love your neighbor. Don't use another's disadvantage unjustly. Don't trick the stupid, trip the blind, or oppress the powerless. Leviticus 19:11-14