There’s no one verse for it, but it’s a clear biblical principle. When people give a little God can do a lot! Little David came with himself and 5 stones. A woman gave her last bit of oil. The disciples were commanded to take nothing. Nothing. A little boy came forward with 5 loaves and 2 fish. Each time they gave enough. Each time God did a lot. Each time God did a miracle. Each time God gave a firsthand experience.