“Will a man rob God? Yet you have robbed Me! But you say, ‘In what way have we robbed You?’ In tithes and offerings.”
Listen to the "Verse by Verse" episode covering this scripture.
Malachi 3:9 explains that not tithing brings a curse, but verse 10 contains a wonderful blessing for those who tithe to God:
“‘Bring all the tithes into the storehouse, that there may be food in My house, and try Me now in this,’ says the LORD of hosts, ‘If I will not open for you the windows of heaven and pour out for you such blessing that there will not be room enough to receive it.’”