1 Samuel 17:12-15

Now David was the son of Jesse, an Ephrathite from Bethlehem in Judah. Jesse had eight sons. In Saul’s time Jesse was an old man. His three oldest sons followed Saul to the war. The first son was Eliab, the second was Abinadab, and the third was Shammah. David was the youngest. Jesse’s three oldest sons followed Saul, but David went back and forth from Saul to Bethlehem, where he took care of his father’s sheep.