(17-22) The stranger, the fatherless, and the widow — are the subject of all the laws in these verses. For the first two (Deuteronomy 24:17-18), see Exodus 22:22-24. As to the harvest, see Leviticus 23:22. It is noticeable that this law is connected with the Feast of Pentecost in that place. Never was such care for the widow and the poor manifested as after the day of Pentecost in the New Testament. When “great grace was upon them all,” it is written that “neither was there any among them that lacked.”
In a very special way and for some special reason, all through the Old Testament, “the Lord careth for the stranger.” What the reason is, if we had the Old Testament only, we might find it hard to discover. But when we open the New Testament, we may see that this is one aspect of the love of God the Father to His Son Jesus Christ, who was one day to come among us as “a stranger,” when there was “no room for Him in the inn.” His coming hither as a stranger could not be unnoticed. And, therefore, the name and mention of the stranger all through the Old Testament is like a path strewn with flowers, in expectation of the coming of one that is greatly beloved. We see angels walking upon the earth, entertained as strangers. The wealthy patriarch, a “prince of God” among the Canaanites, confesses himself a “stranger and pilgrim on the earth.” Those that inherit the land are put in the same category, “Ye are strangers and sojourners with Me.” The stranger sits beside the Levite at Israel’s table. The second great commandment is rehearsed again for his especial benefit. “He shall be unto you as one born among you, and thou shalt love him as thyself.” There is only one key to all this combination of tenderness. “I was a stranger, and ye took me in.”
(18,22) Thou shalt remember that thou wast a bondman in Egypt. — An exhortation thoroughly in place here, in the writings of Moses. In this form it occurs repeatedly in the Pentateuch, but not elsewhere. It is not the language which would naturally suggest itself to the prophets of later times.