Mark 6:18

For John had said to 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 an unclean thing: he hath uncovered his brother's nakedness; they shall be childless.

1 Kings 22:14

And Micaiah said, As the LORD liveth, what the LORD saith to me, that will I speak.

Ezekiel 3:18-19

When I say to 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 call you to witness this day, that I am pure from the blood of all men.

Acts 24:24-26

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

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 an unclean thing: he hath uncovered his brother's nakedness; they shall be childless.
1 Kings 22:14
And Micaiah said, As the LORD liveth, what the LORD saith to me, that will I speak.
Ezekiel 3:18
When I say to 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 call you to witness this day, that I am pure from the blood of all men.
Acts 24:24
And after certain days, when Felix came with his wife Drusilla, who was a Jewess, he sent for Paul, and heard him concerning the faith in Christ.

General references

Matthew 14:4
For John had said to him, It is not lawful for thee to have her.
Luke 3:19
But Herod the tetrarch, being reproved by him on account of Herodias, his brother Philip's wife, and for all the evils which Herod had done,