Leviticus 23:21-22

21You are to make a proclamation on the same day that there is to be a holy convocation, and you shall do no regular work. This is a statute forever in all your dwellings throughout your generations.

22“Now when you reap the harvest of your land, you are not to reap to the furthest corners of your field or gather the gleanings of your harvest. Rather you are to leave them for the poor and for the outsider. I am Adonai your God.”