Leviticus 23:20-23

²⁰And these will be waved by the priest, with the bread of the first-fruits, for a wave offering to the Lord, with the two lambs: they will be holy to the Lord for the priest.

²¹And on the same day, let it be given out that there will be a holy meeting for you: you may do no field-work on that day: it is a rule for ever through all your generations wherever you are living.

²²And when you get in the grain from your land, do not let all the grain at the edges of the field be cut, and do not take up the grain which has been dropped in the field; let that be for the poor, and for the man from another country: I am the Lord your God.

²³And the Lord said to Moses,