Hebrews 10:28

Any one who despised the law of Moses died without mercy by two or three witnesses;

Hebrews 2:2

For if the word spoken by angels was firm, and every transgression and disobedience received a just recompense,

Matthew 18:16

But if he does not hear you, take with you one or two more, that by the mouth of two or three witnesses every word may be established;

John 8:17

And it is written also in your law, that the testimony of two men is true;

Romans 9:15

For he says to Moses, I will be merciful to him to whom I may be merciful, and I will compassionate him whom I may compassionate.

2 Corinthians 13:1

This third time I am coming to you; by the mouth of two or three witnesses shall every word be established.

James 2:13

For he shall have judgment without mercy who shows not mercy; mercy rejoices over judgment.

Treasury of Scripture Knowledge

Summary

He that despised Moses' law died without mercy under two or three witnesses:

Despised

Bible References

Despised

Hebrews 2:2
For if the word spoken by angels was firm, and every transgression and disobedience received a just recompense,

Without

Romans 9:15
For he says to Moses, I will be merciful to him to whom I may be merciful, and I will compassionate him whom I may compassionate.
James 2:13
For he shall have judgment without mercy who shows not mercy; mercy rejoices over judgment.

Under

Matthew 18:16
But if he does not hear you, take with you one or two more, that by the mouth of two or three witnesses every word may be established;
John 8:17
And it is written also in your law, that the testimony of two men is true;
2 Corinthians 13:1
This third time I am coming to you; by the mouth of two or three witnesses shall every word be established.

General references

Matthew 7:27
and the rain descended, and the floods came, and the winds blew and beat on that house, and it fell; and its fall was great.
Matthew 24:21
for at that time there shall be great affliction, such as has not been from the beginning of the world even till now, nor ever shall be.
Mark 3:28
I tell you truly, That all sins and blasphemies with which they blaspheme shall be forgiven the children of men;
Luke 3:9
And already also the axe lies at the root of the trees; every tree therefore which bears not good fruit, is cut down and cast into the fire.
Luke 12:10
And every one that speaks a word against the Son of man shall have forgiveness; but he that blasphemes against the Holy Spirit shall not be forgiven.
John 16:9
of sin, because they believe not on me;