18:24"And in her was found the blood of prophets and of saints and of all who have been slain on the earth."

(Continued from the previous verse)
3. Babylon's Persecutions:

"And in her was found THE BLOOD

The BLOOD, especially His Son's BLOOD, is special to God. Instructions to the Levites indicate how it should be treated. The BLOOD is where life meets atonement; it is identified with the life of the flesh (Leviticus 17:10-16).

But Babylon's purpose for shedding THE BLOOD wasn't for forgiveness or cleansing (Hebrews 9:15-22) but rather for greed and lust for power to the point of idolatry (Revelation 13:4). In his own power grab, the devil has/had to kill mankind to keep them from becoming believer's in Christ. In other words, humans should never be able to accept the atonement that Christ's BLOOD brings.