Deuteronomy 24:20-21

WEB_Strongs(i)
  20 H2251 When you beat H2132 your olive tree, H6286 you shall not go over the boughs H310 again: H1616 it shall be for the foreigner, H3490 for the fatherless, H490 and for the widow.
  21 H1219 When you harvest H3754 your vineyard, H5953 you shall not glean H310 it after H1616 yourselves: it shall be for the foreigner, H3490 for the fatherless, H490 and for the widow.