When you reap the harvest of your land, you are not to reap to the very edges of your field or gather the gleanings of your harvest.
Moses is ordered to deliver the summary of the laws to all the congregation of the children of Israel (Lev 19:2); not to Aaron and his sons only, but to all the people, for they were all concerned to know their duty. Even in the darker ages of the law, that religion could not be of God which boasted of ignorance as its mother.
Commenting on Leviticus 19:1-10
And when ye reap the harvest of your land,.... Of the land of Canaan, when come into it, which having sown, and it was harvest, either barley harvest or wheat harvest, or both, and especially the latter, to which reaping seems best to agree: thou shall not wholly reap the corner of the field; but a part was to be left for the poor.
And when ye reap the harvest of your land, thou shalt not wholly reap the corners of thy field--The right of the poor in Israel to glean after reapers, as well as to the unreaped corners of the field, was secured by a positive statute; and this, in addition to other enactments connected with the ceremonial law, formed a beneficial provision for their support.