Luke 6:38
give, and gifts shall be bestowed on you. Full measure, pressed, shaken down, and running over, shall they pour into your laps; for with the same measure that you use they shall measure to you in return."
Acts 11:29-30
So the disciples decided to send relief, every one in proportion to his means, to the brethren living in Judaea.
2 Corinthians 9:5-11
I have thought it absolutely necessary therefore to request these brethren to visit you before I myself come, and to make sure beforehand that the gift of love which you have already promised may be ready as a gift of love, and may not seem to have been something which I have extorted from you.