I kill ... I wound ... I will make mine arrows drunk with blood, and my sword shall devour flesh. Deuteronomy 32:39-42
God wants you to fear him. If you don't fear him enough, he'll do something to make you afraid of him. Like send lions to eat you.
They feared not the LORD: therefore the LORD sent lions among them, which slew some of them. 2 Kings 17:25
He also likes you to obey his laws, even if you've never heard of them before. If you are unfamiliar with his laws or don't follow them properly, he'll send lions to eat you.
The nations which ... know not the manner of the God of the land: therefore he hath sent lions among them, and, behold, they slay them, because they know not the manner of the God of the land. 17:26
I just thought you should know that.
(The Bible only says that God's lions killed "some of them." I'll guess that there were 10 that were eaten by lions.)