What do we mean when we say a thing is holy? Look at your Bible and it says, “Holy Bible.” What makes it holy? The land of Israel is called “The Holy Land,” and the city of Jerusalem is called “The Holy City.” Why? There is a quality about all three that they share in common. They all belong to God. The Bible is God’s book; Israel is God’s land; Jerusalem is God’s city. They are all God’s property! That is why they are holy; they belong to God.
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green