Revelation 6:7-8

7Then the Lamb opened the fourth seal. I heard the last being say, ‘Come!’

8I looked, and I saw a grey horse. The name of the person who was riding the horse was Death. The place for dead people, called Hades, was following near to him. They had authority to kill people in a quarter of the earth. They could kill people in different ways. They could kill them in wars. They could cause people to die because there was no food. They could cause people to become very ill so that they died. They could also cause wild animals to kill people.