And Judah took a wife for Er his firstborn,.... Chose one for him, and presented her to him for his liking, whom he approving of married:

whose name was Tamar; which signifies a "palm tree": the Targum of Jonathan says, she was the daughter of Shem; but it is altogether improbable that a daughter of his should be living at this time, and young enough to bear children: it is much more probable that she was daughter of Levi, Judah's brother, as an Arabic writer (o) asserts; but it is more likely still that she was the daughter of a Canaanite, who was living in the same place, though his name is not mentioned, Genesis 38:11.

(o) Abulpharag. Hist. Dynast. p. 16.

When Ger was grown up, according to ancient custom (cf. Genesis 21:21; Genesis 34:4) his father gave him a wife, named Thamar, probably a Canaanite, of unknown parentage. But Ger was soon put to death by Jehovah on account of his wickedness. Judah then wished Onan, as the brother-in-law, to marry the childless widow of his deceased brother, and raise up seed, i.e., a family, for him. But as he knew that the first-born son would not be the founder of his own family, but would perpetuate the family of the deceased and receive his inheritance, he prevented conception when consummating the marriage by spilling the semen. ארצה שׁחת, "destroyed to the ground (i.e., let it fall upon the ground), so as not to give seed to his brother" (נתן for תּת only here and Numbers 20:21). This act not only betrayed a want of affection to his brother, combined with a despicable covetousness for his possession and inheritance, but was also a sin against the divine institution of marriage and its object, and was therefore punished by Jehovah with sudden death. The custom of levirate marriage, which is first mentioned here, and is found in different forms among Indians, Persians, and other nations of Asia and Africa, was not founded upon a divine command, but upon an ancient tradition, originating probably in Chaldea. It was not abolished, however, by the Mosaic law (Deuteronomy 25:5.), but only so far restricted as not to allow it to interfere with the sanctity of marriage; and with this limitation it was enjoined as a duty of affection to build up the brother's house, and to preserve his family and name (see my Bibl. Archologie, 108).

And Judah took a wife for Er his firstborn, whose name was Tamar.

38:1-30 The profligate conduct of Judah and his family. - This chapter gives an account of Judah and his family, and such an account it is, that it seems a wonder that of all Jacob's sons, our Lord should spring out of Judah, Heb 7:14. 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. Also, that the worthiness of Christ is of himself, and not from his ancestors. How little reason had the Jews, who were so called from this Judah, to boast as they did, Joh 8:41. What awful examples the Lord proclaims in his punishments, of his utter displeasure at sin! Let us seek grace from God to avoid every appearance of sin. And let that state of humbleness to which Jesus submitted, when he came to put away sin by the sacrifice of himself, in appointing such characters as those here recorded, to be his ancestors, endear the Redeemer to our hearts.