Tithing? This might be a good time to test God’s generosity!

Almost every sermon about tithing starts with Malachi 3:10, the most famous verse about it in the Bible.

Rich Praytor is a Christian believer, and the director of a new movie called "The Tithe Project."

He decided to make a movie about the subject to see if it works in the modern world, if it still "opens up the floodgates of heaven," even today.

He says simply, "I decided to give it a try."

"One Sunday morning I was visiting a church where the pastor offered a tithing challenge," Praytor said. "The pastor said, 'If you tithe for 90 days to our church and at the end you aren't better off financially, then we'll give you your money back.'"

That inspired him to launch – and film – just such a challenge.

One problem: It took him almost six months to find someone who had never tithed before, which meant giving away to a local church of charity 10% of his or her income to document the principle.

"Most people said they couldn't afford to give away 10%," Praytor said. "A few married couples almost said yes, but inevitably one of the spouses would back out. After nearly giving up, I found someone: an independent film producer who was working with me on another project!"

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