Genesis 38:10

10 and therefore the Lord smote him (and so the Lord struck him down), for he did (an) abominable thing.

Genesis 38:10 Meaning and Commentary

Genesis 38:10

And the thing which he did displeased the Lord
Being done out of envy to his brother, and through want of affection to the memory of his name; and it may be out of covetousness to get his estate into his own hands, and especially as it frustrated the end of such an usage of marrying a brother's wife; which appears to be according to the will of God, since it afterwards became a known law of his; and it was the more displeasing, as it was not only a check upon the multiplication of Abraham's seed as promised, but since the Messiah was to come from Judah. This was doing all to hinder it that lay in his power: wherefore he slew him also;
in like manner as he had slain his brother, ( Genesis 38:7 ) .

Genesis 38:10 In-Context

8 Therefore Judah said to Onan, his son, Enter thou [in] to the wife of thy brother, and be thou fellowshipped to her, that thou raise seed to thy brother. (And so Judah said to his son Onan, Sleep with thy brother's wife, and be fellowshipped to her, and so raise thou up seed, or some sons, for thy brother.)

9 And he knew that sons should not be born to him; and he entered [in] to the wife of his brother, and shedded his seed into the earth, lest the free children should be born by the name of the dead brother; (But Onan knew that any sons who would be born would not be his; so he slept with his brother's wife, but he poured out his seed onto the ground, so that no children would be born in the name of his dead brother;)

10 and therefore the Lord smote him (and so the Lord struck him down), for he did (an) abominable thing.

11 Wherefore Judah said to Tamar, his son's wife, Be thou a widow in the house of thy father, till Shelah my son waxed (until my son Shelah hath grown up); for he dreaded lest also he should die as his brethren (did). And (so) she went, and dwelled in the house of her father.

12 Forsooth when many years were passed, the daughter of Shuah, Judah's wife, died; and when comfort was taken after mourning, Judah went up to the shearers of his sheep (After many years had passed, Judah's wife, the daughter of Shuah, died; and after mourning her, when comfort was taken, Judah went up to his sheep-shearers); (yea,) he and Hirah of Adullam, that was [the] keeper of the flock, went up into Timnath.