God instructed the wealthy to leave barley and wheat in the corners of their fields for the poor and needy. Your field is anything that God has given to you. Your corner is anything you are giving back to God.
Your field is your income. Your corner is your outgo. The larger you make your corner, the larger God will make your field. It is just a matter of time.
“And when ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field, neither shalt thou gather the gleanings of thy harvest. 10 And thou shalt not glean thy vineyard, neither shalt thou gather every grape of thy vineyard; thou shalt leave them for the poor and stranger; I am the Lord your God.”
(Leviticus 19:9-10)