3 The sons of Judah: Er, and Onan, and Shelah; which three were born to him of Shua's daughter the Canaanitess. Er, Judah's firstborn, was wicked in the sight of Yahweh; and he killed him.
Judah saw there a daughter of a certain Canaanite whose name was Shua. He took her, and went in to her. She conceived, and bore a son; and he named him Er. She conceived again, and bore a son; and she named him Onan. She yet again bore a son, and named him Shelah: and he was at Chezib, when she bore him. Judah took a wife for Er, his firstborn, and her name was Tamar. Er, Judah's firstborn, was wicked in the sight of Yahweh. Yahweh killed him. Judah said to Onan, "Go in to your brother's wife, and perform the duty of a husband's brother to her, and raise up seed to your brother." Onan knew that the seed wouldn't be his; and it happened, when he went in to his brother's wife, that he spilled it on the ground, lest he should give seed to his brother. The thing which he did was evil in the sight of Yahweh, and he killed him also.
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Commentary on 1 Chronicles 2 Matthew Henry Commentary
Chapter 2
We have now come to what was principally intended, the register of the children of Israel, that distinguished people, that were to "dwell alone, and not be reckoned among the nations.' Here we have,
The best exposition we can have of this and the following chapters, and which will give the clearest view of them, is found in those genealogical tables which were published with some of the first impressions of the last English Bible about 100 years ago, and continued for some time; and it is a pity but they were revived in some of our later editions, for they are of great use to those who diligently search the scriptures. They are said to be drawn up by that great master in scripture-learning, Mr. Hugh Broughton. We meet with them sometimes in old Bibles.
1Ch 2:1-17
Here is,
1Ch 2:18-55
The persons mentioned in the former paragraph are most of them such as we read of, and most of them such as we read much of, in other scriptures; but very few of those to whom this paragraph relates are mentioned any where else. It should seem, the tribe of Judah were more full and exact in their genealogies than any other of the tribes, in which we must acknowledge a special providence, for the clearing of the genealogy of Christ.