Genesis 38:9
 Genesis 38:9 
New International Version (©2011)
But Onan knew that the child would not be his; so whenever he slept with his brother's wife, he spilled his semen on the ground to keep from providing offspring for his brother.

New Living Translation (©2007)
But Onan was not willing to have a child who would not be his own heir. So whenever he had intercourse with his brother's wife, he spilled the semen on the ground. This prevented her from having a child who would belong to his brother.

English Standard Version (©2001)
But Onan knew that the offspring would not be his. So whenever he went in to his brother’s wife he would waste the semen on the ground, so as not to give offspring to his brother.

New American Standard Bible (©1995)
Onan knew that the offspring would not be his; so when he went in to his brother's wife, he wasted his seed on the ground in order not to give offspring to his brother.

King James Bible (Cambridge Ed.)
And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother.

Holman Christian Standard Bible (©2009)
But Onan knew that the offspring would not be his, so whenever he slept with his brother's wife, he released his semen on the ground so that he would not produce offspring for his brother.

International Standard Version (©2012)
But Onan knew that the offspring wouldn't be his own heir, so whenever he had sexual relations with his brother's wife, he would spill his semen on the ground to avoid fathering offspring for his brother.

NET Bible (©2006)
But Onan knew that the child would not be considered his. So whenever he had sexual relations with his brother's wife, he withdrew prematurely so as not to give his brother a descendant.

GOD'S WORD® Translation (©1995)
But Onan knew that the descendant wouldn't belong to him, so whenever he slept with his brother's widow, he wasted his semen on the ground to avoid giving his brother a descendant.

King James 2000 Bible (©2003)
And Onan knew that the descendant would not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest that he should give a descendant to his brother.

American King James Version
And Onan knew that the seed should not be his; and it came to pass, when he went in to his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother.

American Standard Version
And Onan knew that the seed would not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest he should give seed to his brother.

Douay-Rheims Bible
He knowing that the children should not be his, when he went in to his brother's wife, spilled his seed upon the ground, lest children should be born in his brother's name.

Darby Bible Translation
But when Onan knew that the seed should not be his own, it came to pass when he went in to his brother's wife, that he spilled it on the ground, in order to give no seed to his brother.

English Revised Version
And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest he should give seed to his brother.

Webster's Bible Translation
And Onan knew that the seed would not be his: and it came to pass, when he went in to his brother's wife, that he frustrated the purpose, lest he should give seed to his brother.

World English Bible
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.

Young's Literal Translation
and Onan knoweth that the seed is not reckoned his; and it hath come to pass, if he hath gone in unto his brother's wife, that he hath destroyed it to the earth, so as not to give seed to his brother;

Matthew Henry's Concise Commentary

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.


Pulpit Commentary

Verses 9, 10. - And Onan knew that the seed should not be his; and it came to pass, when - literally, and it was if, i.e. whenever (cf. Ewald, Hebrews Synt., § 3456) - he went in unto his brother's wife, that he spilled it on the ground (literally, destroyed to the ground), lest that he should (or, so as not to) give seed to his brother. And the thing which he did displeased (literally, was evil in the eyes of) the Lord: - the word Jehovah is employed not because the writer was a late interpolator, but because the sin of Onan was an offence against the sanctity and prosperity of the theocratic family (Hengstenberg) - wherefore he (i.e. Jehovah) slew him also (vide supra).


Gill's Exposition of the Entire Bible

And Onan knew that the seed should not be his,.... Should not be called a son of his, but a son of his brother Er; this is to be understood only of the firstborn; all the rest of the children born afterwards were reckoned the children of the real parent of them; this shows this was a custom in use in those times, and well known, and was not a peculiar case:

and it came to pass, when he went in unto his brother's wife; to cohabit with her, as man and wife, he having married her according to his father's direction:

that he spilled it on the ground, lest he should give his seed to his brother: lest his brother's wife he had married should conceive by him, and bear a son that should be called his brother's, and inherit his estate; and this is the sin, which from him is called Onania, a sin condemned by the light of nature, as well as by the word of God, and very prejudicial to mankind, as well as displeasing to God, as follows:


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Judah and Tamar
8And Judah said to Onan, Go in to your brother's wife, and marry her, and raise up seed to your brother. 9And Onan knew that the seed should not be his; and it came to pass, when he went in to his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother. 10And the thing which he did displeased the LORD: why he slew him also. …

Deuteronomy 25:6 The first son she bears shall carry on the name of the dead brother so that his name will not be blotted out from Israel.
Genesis 38:10 What he did was wicked in the LORD's sight; so the LORD put him to death also.