Matthew 23:31-35

So you witness to yourselves, that you are the sons of those who murdered the prophets.

Luke 11:50-51

In order that the blood of all the prophets poured out from the foundation of the world, may be required from this generation;

Treasury of Scripture Knowledge

Summary

So ye shall not pollute the land wherein ye are: for blood it defileth the land: and the land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it.

Bible References

It defileth

Matthew 23:31
So you witness to yourselves, that you are the sons of those who murdered the prophets.
Luke 11:50
In order that the blood of all the prophets poured out from the foundation of the world, may be required from this generation;