Jesus taught that we should share with others who cannot repay us.

Luke 14:12-14

12 Jesus also said to the Pharisee who had invited him to the meal, “When you (sg) invite people to a midday or evening meal, do not invite your friends or your family or your other relatives or your rich neighbors. They can later invite you (sg) for a meal. In that way they will repay you. 13 Instead, when you (sg) give a feast, invite poor people, crippled people, lame people, or blind people. 14 They will be unable to repay you. But God will bless you! He will repay you at the time when he causes righteous people to become alive again.”