Armenia in comments -- Book: Genesis (tGen) Ծննդոց
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tGen 38::1 About this time, i.e., after the sale of Joseph, while still feeding the flocks of Jacob along with his brethren (Gen 37:26),
(Note: As the expression "at that time" does not compel us to place Judah's marriage after the sale of Joseph, many have followed Augustine (qusaet. 123), and placed it some years earlier. But this assumption is rendered extremely improbable, if not impossible, by the fact that Judah was not merely accidentally present when Joseph was sold, but was evidently living with his brethren, and had not yet set up an establishment of his own; whereas he had settled at Adullam previous to his marriage, and seems to have lived there up to the time of the birth of the twins by Thamar. Moreover, the 23 years which intervened between the taking of Joseph into Egypt and the migration of Jacob thither, furnish space enough for all the events recorded in this chapter. If we suppose that Judah, who was 20 years old when Joseph was sold, went to Adullam soon afterwards and married there, is three sons might have been born four or five years after Joseph's captivity. And if his eldest son was born about a year and a half after the sale of Joseph, and he married him to Thamar when he was 15 years old, and gave her to his second son a year after that, Onan's death would occur at least five years before Jacob's removal to Egypt; time enough, therefore, both for the generation and birth of the twin-sons of Judah by Thamar, and for Judah's two journeys into Egypt with his brethren to buy corn. (See Gen 46:8.))
Judah separated from them, and went down (from Hebron, Gen 37:14, or the mountains) to Adullam, in the lowland (Jos 15:35), into the neighbourhood of a man named Hirah. "He pitched (his tent, Gen 26:25) up to a man of Adullam," i.e., in his neighbourhood, so as to enter into friendly intercourse with him.
Gen 38:2-5
There Judah married the daughter of Shuah, a Canaanite, and had three sons by her: Ger (ער), Onan, and Shelah. The name of the place is mentioned when the last is born, viz., Chezib or Achzib (Jos 15:44; Mic 1:14), in the southern portion of the lowland of Judah, that the descendants of Shelah might know the birth-place of their ancestor. This was unnecessary in the case of the others, who died childless.
Gen 38:6-10
When Ger was grown up, according to ancient custom (cf. Gen 21:21; Gen 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 Num 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 Chald:ea. It was not abolished, however, by the Mosaic law (Deu 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).
Gen 38:11
The sudden death of his two sons so soon after their marriage with Thamar made Judah hesitate to give her the third as a husband also, thinking, very likely, according to a superstition which we find in Tobit 3:7ff., that either she herself, or marriage with her, had been the cause of her husbands' deaths. He therefore sent her away to her father's house, with the promise that he would give her his youngest son as soon as he had grown up; though he never intended it seriously, "for he thought lest (פּן אמר, i.e., he was afraid that) he also might die like his brethren." Genesis 38:12