1 Samuel 17:14

David was the youngest, while the three oldest had followed Saul.

1 Samuel 16:11

Then Samuel told Jesse, "Are these all the young men?" He said, "There yet remains the youngest one, and right now he's tending the sheep." Samuel told Jesse, "Send someone to get him, for we won't do anything else until he arrives here."

Genesis 25:23

"Two nations are in your womb," the LORD responded, "and two separate people will emerge. One people will be the stronger, and the older one will 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
Then Samuel told Jesse, "Are these all the young men?" He said, "There yet remains the youngest one, and right now he's tending the sheep." Samuel told Jesse, "Send someone to get him, for we won't do anything else until he arrives here."
Genesis 25:23
"Two nations are in your womb," the LORD responded, "and two separate people will emerge. One people will be the stronger, and the older one will serve the younger."

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