Genesis 38:8

This chapter gives us an account of Judah and his family, and such an account it is that one would wonder that, of all Jacob's sons, our Lord should spring out of Judah, Heb 7:14. If we were to form a character of him by this story, we should not say, "Judah, thou art he whom thy brethren shall praise," Gen 49:8. But God will show that his choice is of grace and not of merit, and that Christ came into the world to save sinners, even the chief, and is not ashamed, upon their repentance, to be allied to them, also that the worth and worthiness of Jesus Christ are personal, of himself, and not derived from his ancestors. Humbling himself to be "made in the likeness of sinful flesh," he was pleased to descend from some that were infamous. How little reason had the Jews, who were so called from this Judah, to boast, as they did, that they were not born of fornication! Joh 8:41. We have, in this chapter, I. Judah's marriage and issue, and the untimely death of his two eldest sons (Gen 38:1-11). II. Judah's incest with his daughter-in-law Tamar, without his knowing it (Gen 38:12-23). III. His confusion, when it was discovered (Gen 38:24-26). IV. The birth of his twin sons, in whom his family was built up (Gen 38:27, etc.).

38:8 as our law requires. . . . You must produce an heir for your brother: The custom that informs this episode is the law for levirate marriage (Latin levir, “husband’s brother”). By this custom, which was later incorporated into God’s law for Israel (Deut 25:5-10), if a man died childless, his brother or nearest relative would marry his widow to produce a child who would carry on the family name of the deceased and inherit his property. Apparently, the near kinsman had a right to refuse, but he would be disgraced in the family for refusing to perpetuate his brother’s name.