1st Samuel 17:14

11 And Saul and all Israel, hearing those words of the Philistine, were troubled and full of fear.

12 Now David was the son of that Ephrathite of Beth-lehem-judah named Jesse, who had eight sons; and he was an old man in Saul's day, and far on in years.

13 And the three oldest sons of Jesse had gone with Saul to the fight: the names of the three who went to the fight were Eliab, the oldest, and Abinadab the second, and Shammah the third.

14 And David was the youngest: and the three oldest were with Saul's army.

15 Now David went to and from Saul, looking after his father's sheep at Beth-lehem.

16 And the Philistine came near every morning and evening for forty days.

17 And Jesse said to his son David, Take now for your brothers an ephah of this dry grain and these ten cakes of bread, and go quickly with them to the tents to your brothers;