"When you reap the harvest of your land, you shall not reap to the very edges of your field, or gather the gleanings of your harvest. 10You shall not strip your vineyard bare, or gather the fallen grapes of your vineyard; you shall leave them for the poor and the alien: I am the LORD your God." Leviticus 19:9
The process described above is called gleaning. God wants us to leave some of the fruit of the land (His land) to be available for those who are poor and those who do not have any of their own land (alien). The realization is twofold. First the land is not ours and second God gives enough for everybody if we can share.
Gleaning is the process by which we distribute some of the extra from the land to those who are in need. The county which I live in is starting a gleaning project. I am thankful that the secular world would obey God's command.
See their website here