Albert Barnes Commentary Leviticus 19:9-10

"And when ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field, neither shalt thou gather the gleaning of thy harvest. And thou shalt not glean thy vineyard, neither shalt thou gather the fallen fruit of thy vineyard; thou shalt leave them for the poor and for the sojourner: I am Jehovah your God." — Leviticus 19:9-10 (ASV)

See Deuteronomy 24:19-21. “Grape” signifies fallen fruit of any kind; and “vineyard” a fruit garden of any kind. Compare Deuteronomy 23:24.

The poor is the poor Israelite; “the stranger” is properly the foreigner, who could possess no land of his own in the land of Israel.