The harp is a musical instrument invented many centuries ago. When properly strung and played upon it yields sweet music, making glad the heart. The first mention of the harp made in the Bible is in Genesis 4:21, and the inventor's name was Jubal. He was therefore called "the father of all such as handle the harp and organ." It was 1812 years before the coming of Jesus in the flesh that God organized the twelve tribes of Israel, the descendants of Jacob, into a nation, which nation thereafter was known as the nation of Israel. It was the only nation with which God made a covenant, and he did not recognize any other nation in the same way. (Amos 3:2) The nation of Israel was used to make living pictures or types, foreshadowing better things to come; and those who study the Scriptural account of Israel's experiences are able to approximate closely future events which will be good for mankind.-1 Corinthians 10:1-13; Hebrews 10:1.