Mark 6:18

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

Leviticus 18:16

The nakedness of thy brother's wife thou shalt not uncover: it is thy brother's nakedness.

Leviticus 20:21

And a man who shall take his brother's wife, it is uncleanness: he uncovered his brother's nakedness: they shall die childless.

1 Kings 22:14

And Micaiah will say, Jehovah lives, for what Jehovah shall say to me I will speak it.

Ezekiel 3:18-19

In my saying to the unjust, Dying, thou shalt die; and thou admonished him not, and thou spakest not to admonish the unjust from his way of injustice to preserve him alive; this unjust one shall die in his iniquity, and his blood I will seek from thy hand.

Matthew 14:3-4

For Herod, having seized John, bound him, and put him in prison for Herodias, his brother Philip's wife:

Acts 20:26-27

Wherefore I testify to you in this day, that I pure from the blood of all.

Acts 24:24-26

And after certain days, Felix, having been present with Drusilla his wife, being a Jewess, sent for Paul and heard him of 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
The nakedness of thy brother's wife thou shalt not uncover: it is thy brother's nakedness.
Leviticus 20:21
And a man who shall take his brother's wife, it is uncleanness: he uncovered his brother's nakedness: they shall die childless.
1 Kings 22:14
And Micaiah will say, Jehovah lives, for what Jehovah shall say to me I will speak it.
Ezekiel 3:18
In my saying to the unjust, Dying, thou shalt die; and thou admonished him not, and thou spakest not to admonish the unjust from his way of injustice to preserve him alive; this unjust one shall die in his iniquity, and his blood I will seek from thy hand.
Matthew 14:3
For Herod, having seized John, bound him, and put him in prison for Herodias, his brother Philip's wife:
Acts 20:26
Wherefore I testify to you in this day, that I pure from the blood of all.
Acts 24:24
And after certain days, Felix, having been present with Drusilla his wife, being a Jewess, sent for Paul and heard him of the faith in Christ.

General references

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