Mark 6:18

For John said unto Herod, It is not lawful for thee to have thy brother's wife.

Leviticus 18:16

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

Leviticus 20:21

And if a man shall take his brother's wife, it is impurity: he hath uncovered his brother's nakedness; they shall be childless.

1 Kings 22:14

And Micaiah said, As Jehovah liveth, what Jehovah saith unto me, that will I speak.

Ezekiel 3:18-19

When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thy hand.

Matthew 14:3-4

For Herod had laid hold on John, and bound him, and put him in prison for the sake of Herodias, his brother Philip's wife.

Acts 20:26-27

Wherefore I testify unto you this day, that I am pure from the blood of all men.

Acts 24:24-26

But after certain days, Felix came with Drusilla, his wife, who was a Jewess, and sent for Paul, and heard him concerning the faith in Christ Jesus.

Treasury of Scripture Knowledge

Summary

For John had said unto Herod, It is not lawful for thee to have thy brother's wife.

General references

Bible References

It is

Leviticus 18:16
Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.
Leviticus 20:21
And if a man shall take his brother's wife, it is impurity: he hath uncovered his brother's nakedness; they shall be childless.
1 Kings 22:14
And Micaiah said, As Jehovah liveth, what Jehovah saith unto me, that will I speak.
Ezekiel 3:18
When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thy hand.
Matthew 14:3
For Herod had laid hold on John, and bound him, and put him in prison for the sake of Herodias, his brother Philip's wife.
Acts 20:26
Wherefore I testify unto you this day, that I am pure from the blood of all men.
Acts 24:24
But after certain days, Felix came with Drusilla, his wife, who was a Jewess, and sent for Paul, and heard him concerning the faith in Christ Jesus.

General references

Matthew 14:4
For John said unto him, It is not lawful for thee to have her.
Luke 3:19
but Herod the tetrarch, being reproved by him for Herodias his brother's wife, and for all the evil things which Herod had done,

American Standard Version Public Domain