Take the Three-Month Tithe Challenge.
The Bible asks us to give our first and our best back to God, and He will bless the rest. We return to the Lord 10% of what He's given us because it belongs to Him. If you're not tithing already, a great way to start is with the Three-Month Tithe Challenge. Essentially, it's a contract based on the promises of God in Malachi 3:10-11.
If you tithe for three months and God doesn't hold true to His promises of blessings, we will refund 100% of your tithe.