When I was a poor college student trying to exist on only $25 a month in a little 14-foot trailer [caravan] with a wife and two small children, my wife suggested that God would bless us if we would tithe 1 of even what little we had.

1 Tithe: to voluntarily contribute a fixed percentage (usually a minimum of 10%) of your income or produce to God’s work

I protested at first that we couldn’t afford it, but when we prayed to find the Lord’s will about it, we opened the Bible to the very scripture about the widow who gave her last two mites—coins worth only a fraction of a penny by today’s standards—to the Lord’s treasury (Mark 12:41–44).
Well, I couldn’t argue with that! I’d been saying we couldn’t afford to cast in one tenth of our living, and here in the Bible was a poor widow casting in all her living! So the next Sunday we tithed our $2.50 to the church we were attending then, which was the only place we knew to tithe, and Monday morning, after one of my college classes, the professor said: “Dave, here’s something someone gave me to give you!” It was a 20-dollar bill—nearly 10 times as much as we had tithed.
And that’s the way God is: He loves to outgive you, and He’ll never let you outgive Him! He’ll always give you much, much more than you ever give if your motives for giving are right. I’m not even sure the Temple needed that poor widow’s two mites, but God honored her for her sacrifice just the same. As Jesus remarked, “Assuredly, I say to you that this poor widow has put in more than all those who have given to the treasury; for they all put in out of their abundance, but she out of her poverty put in all that she had, her whole livelihood” (Mark 12:43–44).

So you can even cast in all your living and still not hurt, because God will bless you for it. If your intentions are good and pure, God will bless you for giving and honor and prosper you for it.
It’s His promise! He said, “Bring all the tithes into the storehouse, that there may be food in My house, and try Me now in this … 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” (Malachi 3:10). “Seek first the Kingdom of God and His righteousness, and all these things shall be added to you” (Matthew 6:33).
God’s going to repay you! “Whatever you spend,” He says, “I will repay!” Do you remember who said that? It’s in that wonderful story about the Good Samaritan who found the poor man along the side of the road who’d been beaten by thieves. The Good Samaritan picked him up and took him to an inn and told the innkeeper, “Whatever you spend, I will repay you.” (See Luke 10:30–37.)
I think you’re going to find that in giving to God and His work, you’re not really sacrificing at all; you’re just investing, and the returns are going to be far beyond anything you have invested!

So put your investment in Christ Jesus and God’s work, and you’ll reap eternal dividends! God will bless you for it and see that you get good returns on your investment—the best! You’ll share forever in the eternal rewards of the souls won as a result of your giving. Put God first and lay aside the tithe for His work, then He’s promised to put you first with abundant blessings. He will bless you with so much that you won’t even be able to hold it all!