Leviticus 23:22

And when ye reap the harvest of your land, thou shalt not make clean riddance of the corners of thy field when thou reapest, in mowing to the very border of the land, neither shalt thou gather any gleaning of thy harvest, the stalks and ears that dropped out in harvesting; thou shalt leave them unto the poor and to the stranger. I am the Lord, your God. To celebrate a festival of thanksgiving to the Lord for the blessings of His goodness and at the same time to ignore the needs of the poor is a combination which will hardly meet with the approval of the Lord,