Leviticus 23:20-22 New Revised Standard Version, Anglicised (NRSVA)
20 The priest shall raise them with the bread of the first fruits as an elevation-offering before the Lord, together with the two lambs; they shall be holy to the Lord for the priest. 21 On that same day you shall make proclamation; you shall hold a holy convocation; you shall not work at your occupations. This is a statute for ever in all your settlements throughout your generations.
22 When you reap the harvest of your land, you shall not reap to the very edges of your field, or gather the gleanings of your harvest; you shall leave them for the poor and for the alien: I am the Lord your God.