Deuteronomy 24:19-21

ASV_Strongs(i)
  19 H7114 When thou reapest H7105 thy harvest H7704 in thy field, H7911 and hast forgot H6016 a sheaf H7704 in the field, H7725 thou shalt not go again H3947 to fetch H1616 it: it shall be for the sojourner, H3490 for the fatherless, H490 and for the widow; H3068 that Jehovah H430 thy God H1288 may bless H4639 thee in all the work H3027 of thy hands.
  20 H2251 When thou beatest H2132 thine olive-tree, H6286 thou shalt not go over the boughs H310 again: H1616 it shall be for the sojourner, H3490 for the fatherless, H490 and for the widow.
  21 H1219 When thou gatherest H3754 the grapes of thy vineyard, H5953 thou shalt not glean H310 it after H1616 thee: it shall be for the sojourner, H3490 for the fatherless, H490 and for the widow.