Luke 6:35 But love your enemies, do good, and lend, hoping for nothing in return; and your reward will be great, and you will be sons of the Most High. For He is kind to the unthankful and evil.
2 Samuel 24:24 Then the king said to Araunah, “No, but I will surely buy it from you for a price; nor will I offer burnt offerings to the LORD my God with that which costs me nothing.” So David bought the threshing floor and the oxen for fifty shekels of silver.
Matthew 6:1-4 'Take heed that you do not do your charitable deeds before men, to be seen by them. Otherwise you have no reward from your Father in heaven. Therefore, when you do a charitable deed, do not sound a trumpet before you as the hypocrites do in the synagogues and in the streets, that they may have glory from men. Assuredly, I say to you, they have their reward. But when you do a charitable deed, do not let your left hand know what your right hand is doing, that your charitable deed may be in secret; and your Father who sees in secret will Himself reward you openly.
Mark 12:43-44 So He called His disciples to Himself and said to them, "Assuredly, I say to you that this poor widow has put in more than all those who have given to the treasury; for they all put in out of their abundance, but she out of her poverty put in all that she had, her whole livelihood."
Luke 6:30 Give to everyone who asks of you. And from him who takes away your goods do not ask them back.
2 Corinthians 9:7 So let each one give as he purposes in his heart, not grudgingly or of necessity; for God loves a cheerful giver.