Because He has already given us so much, we believe God has called us to give back to him sacrificially in three primary areas: Our time, our talents, and our treasures. The Bible teaches that we give not in order to gain blessings from God, but because we have received blessings already. God already owns everything (Psalm 24:1). We give back to Him because He has so graciously given to us.
2 Corinthians 9:6-8 (CSBBible)
The point is this: The person who sows sparingly will also reap sparingly, and the person who sows generously will also reap generously. Each person should do as he has decided in his heart —not reluctantly or out of compulsion, since God loves a cheerful giver. And God is able to make every grace overflow to you, so that in every way, always having everything you need, you may excel in every good work.