2 Corinthians 8:7-9

But as you excel in everything—in faith, in speech, in knowledge, and in all eagerness and in the love from us that is in you—make sure that you excel in this act of kindness too.  I am not saying this as a command, but I am testing the genuineness of your love by comparison with the eagerness of others.  For you know the grace of our Lord Jesus Christ, that although he was rich, he became poor for your sakes, so that you by his poverty could become rich.

In Malachi 3:8-12 God says concerning Israel “But you ask, ‘How are we robbing you?’ ‘In tithes and offerings. You are under a curse—your whole nation—because you are robbing me. Bring the whole tithe into the storehouse, that there may be food in my house. Test me in this,’ says the Lord Almighty, ‘and see if I will not throw open the floodgates of heaven and pour out so much blessing that there will not be room enough to store it. I will prevent pests from devouring your crops, and the vines in your fields will not drop their fruit before it is ripe,’ says the Lord Almighty. ‘Then all the nations will call you blessed, for yours will be a delightful land,’ says the Lord Almighty.” Generosity is the way of the Kingdom of Heaven. Our gifts, finances, everything belongs to God. God blesses those who give sacrificially.