Leviticus 23:20-22

New Catholic Bible

²⁰ The priest shall wave them together with the bread of the firstfruits as a wave offering to the Lord, with two holy lambs. They shall be an offering to the Lord for the priest. ²¹ You shall proclaim on that day that there is to be a holy assembly. You are not to do any heavy labor. This shall be a statute forever in all of your dwellings, from one generation to the next.

²² “When you collect the harvest of your land, you shall not gather it right up to the corners of the field, nor shall you gather up the gleanings of your harvest. You shall leave them for the poor and the alien. I am the Lord, your God.”