Leviticus 19:9-10

'When you reap the harvest of your land, you shall not wholly reap the corners of your field, nor shall you gather the gleanings of your harvest. And you shall not glean your vineyard, nor shall you gather every grape of your vineyard; you shall leave them for the poor and the stranger: I am the Lord your God." - Leviticus 19:9-10 (NKJV)