This entire land has been guilty of robbing God (Malachi 3:6-10), placing themselves under a curse in the manner of Cain, who offered a defiled, blemished sacrifice. If material possessions are more important than our relationship with God, we will find no satisfaction in the things we possess, but actually will be led into sin by our lusts and desires. Both tithing and offerings are test commands, with the difference that the amount of the offering is left up to us, placing an additional test upon our sincerity generosity, and intent to serve, obey, and please God.