Giving of the tithe is a biblical mandate the Prophets and Jesus made clear. 100% of all you receive belongs to the Lord. We have the privilege to return a portion of that to furthering the ministry of the local church.
In Luke 6:38 these words of Jesus are recorded: Give, and it will be given to you. Good measure, pressed down, shaken together, running over, will be put into your lap. For with the measure you use it will be measured back to you.”
In Malachi 3: 10 Bring the full tithe into the storehouse, that there may be food in my house. And thereby put me to the test, says the Lord of hosts, if I will not open the windows of heaven for you and pour down for you a blessing until there is no more need.
God desires for us to be found faithful and obedient.