Shall not enter into the congregation, etc. - If by entering the congregation be meant the bearing a civil office among the people, such as magistrate, judge, etc., then the reason of the law is very plain; no man with any such personal defect as might render him contemptible in the sight of others should bear rule among the people, lest the contempt felt for his personal defects might be transferred to his important office, and thus his authority be disregarded. The general meaning of these words is, simply, that the persons here designated should not be so incorporated with the Jews as to partake of their civil privileges.
Compare Leviticus 21:17-24. Such persons, exhibiting a mutilation of that human nature which was made in God‘s image, were rejected from the covenant entirely. However, they could be proselytes (compare Acts 8:27). The Old Testament itself foretells Isaiah 56:3-5 the removal of this ban when under the kingdom of Messiah the outward and emblematic perfection and sanctity of Israel should be fulfilled in their inner meaning by the covenanted presence and work of the Holy Spirit in the Church.