Luke 6:38 Give and it will be given to you. A good measure, pressed down, shaken together and running over, will be poured into your lap. For the measure you use, it will be measured to you.
I often hear this verse being used to motivate people to be generous givers. People use this verse to give to others expecting that God will abundantly replace what they have given. If we give someone on the street in need our last $20 bill, we are not guaranteed to find $40 elsewhere. I am not going to say that God will never do that for us. But God does not promise that he will do so, and we should never expect it. Second Corinthians 9:7 tells us that God loves a cheerful giver, not an expectant giver.
2 Corinthians 9:6-11