Malachi 3:6-12 (ESV):
6 “For I the Lord do not change; therefore you, O children of Jacob, are not consumed. 7 From the days of your fathers you have turned aside from my statutes and have not kept them. Return to me, and I will return to you, says the Lord of hosts. But you say, ‘How shall we return?’ 8 Will man rob God? Yet you are robbing me. But you say, ‘How have we robbed you?’ In your tithes and contributions. 9 You are cursed with a curse, for you are robbing me, the whole nation of you. 10 Bring the full tithe into the storehouse, that there may be food in my house. And thereby put me to the test, says the Lord of hosts, if I will not open the windows of heaven for you and pour down for you a blessing until there is no more need. 11 I will rebuke the devourer for you, so that it will not destroy the fruits of your soil, and your vine in the field shall not fail to bear, says the Lord of hosts. 12 Then all nations will call you blessed, for you will be a land of delight, says the Lord of hosts.
Many Christians believe that the curse for not tithing and the blessings for tithing mentioned in Malachi 3:6-12 apply to the New Testament Church as well. In other words, they believe that Malachi 3:6-12 teaches spiritual laws (curses/blessings) whose scope encompasses both Testaments, not just the first. In their view, Christians who do not tithe would be under a curse, and those who do tithe would be able to enjoy the promised blessings.
What is the biblical basis for the belief that curses and blessings regarding tithing in the Old Testament still apply to the New Testament Church?
A natural extension of this question would be to ask the same thing about every promised curse and blessing found in the Old Testament. Which Old Testament blessings/curses still find application today?
As an example, Ephesians 6:1-3 comes to mind "Children, obey your parents in the Lord, for this is right. 2 “Honor your father and mother” (this is the first commandment with a promise), 3 “that it may go well with you and that you may live long in the land.”, which is a clear New Testament validation of a blessing promised in the Old Testament (Exodus 20:12). Should we see this as evidence that all promised curses/blessings in the Old Testament still apply? Or should we be more cautious and approach this on a case-by-case basis?