God's Guarantees for Giving

God is ready to increase the wealth of anyone who will obey His Word. God is bound to honor His Word. But what exactly does His Word tell us? Many Christians are either confused or deceived about the subject of giving. Should we pay tithes or give freely? Do we give all our funds to our local church? What about giving to the poor and needy? Jesus stated that we would burn in an eternal fire if we did not care for those in need (Matthew 25). Why do many Christian leaders avoid this command?