1 Samuel 17:14

And David was the youngest; and the three eldest followed Saul.

1 Samuel 16:11

And Samuel said unto Jesse, Are here all thy children? And he said, There remaineth yet the youngest, and, behold, he is keeping the sheep. And Samuel said unto Jesse, Send and fetch him; for we will not sit down till he come hither.

Genesis 25:23

And Jehovah said unto her, Two nations are in thy womb, And two peoples shall be separated from thy bowels. And the one people shall be stronger than the other people. And the elder shall serve the younger.

Treasury of Scripture Knowledge

Summary

And David was the youngest: and the three eldest followed Saul.

Bible References

The youngest

1 Samuel 16:11
And Samuel said unto Jesse, Are here all thy children? And he said, There remaineth yet the youngest, and, behold, he is keeping the sheep. And Samuel said unto Jesse, Send and fetch him; for we will not sit down till he come hither.
Genesis 25:23
And Jehovah said unto her, Two nations are in thy womb, And two peoples shall be separated from thy bowels. And the one people shall be stronger than the other people. And the elder shall serve the younger.

American Standard Version Public Domain