Leviticus 23:20-22

New Revised Standard Version, Anglicised

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.