Leviticus 20:21

19 You must not have sexual relations with the sister of your mother or your father, for it is exposing one’s own kin; both shall bear their iniquity.

20 If a man lies with his uncle’s wife, he has uncovered the nakedness of his uncle. They will bear their sin; they shall die childless.

If a man marries his brother’s wife, it is an act of impurity. He has uncovered the nakedness of his brother; they shall be childless.

22 You are therefore to keep all My statutes and ordinances, so that the land where I am bringing you to live will not vomit you out.

23 You must not follow the statutes of the nations I am driving out before you. Because they did all these things, I abhorred them.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
If a man marries his brother’s wife, it is an act of impurity. He has uncovered the nakedness of his brother; they shall be childless.
KJV
And if a man shall take his brother’s wife, it is an unclean thing: he hath uncovered his brother’s nakedness; they shall be childless.
WEB
“‘If a man takes his brother’s wife, it is an impurity. He has uncovered his brother’s nakedness. They shall be childless.
ASV
And if a man shall take his brother`s wife, it is impurity: he hath uncovered his brother`s nakedness; they shall be childless.
DARBY
And if a man take his brother's wife, it is an unclean thing: he hath uncovered his brother's nakedness: they shall be childless.
BLB
And a man, if he takes the wife of his brother, it [is] an unclean thing. He has uncovered the nakedness of his brother. They shall be childless.
ÅB
Når en mann tar sin brors hustru, da er det skamløs ferd; han har vanæret sin bror, de skal være barnløse.
OTB
‘Hvis en mann gifter seg med sin brors kone, er det en handling av urenhet; han har avdekket sin brors nakenhet. De skal være barnløse.
B1930
Når en mann tar sin brors hustru, da er det skamløs ferd; han har vanæret sin bror, de skal være barnløse.

Study notes (Tyndale)

Original text and word study

Cross references