Genesis 38:8

King James Version - American Edition

And Judah said unto Onan, Go in unto thy brother's wife, and marry her, and raise up seed to thy brother.

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And the firstborn said unto the younger, Our father is old, and there is not a man in the earth to come in unto us after the manner of all the earth:

Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.

And Na-o´mi said, Turn again, my daughters: why will ye go with me? are there yet any more sons in my womb, that they may be your husbands?