Gleaning is the traditional Biblical practice of gathering crops that would otherwise be left in the fields to rot, or be plowed under after harvest. The biblical mandate for the practice comes from Deuteronomy 24:19,
When you reap your harvest in your field and forget a sheaf in the field, you shall not go back to get it. It shall be for the sojourner, the fatherless, and the widow, that the LORD your God may bless you in all the work of your hands.
Gleaning provided the poor with a way to use their own labor to provide for their needs. For us today, the practice provides a useful Biblical model for how we can help others to help themselves. “Those with wealth are to provide opportunities for the poor to rise out of poverty,” writes Marvin Olasky, in Renewing American Compassion, “the typical starting point in the Old Testament was gleaning.”