1 Samuel 30:1

And he seized Agag the king of the Amalekites alive and devoted to destruction all the people with the edge of the sword.

“We made a raid on the Negev of the Cherethites and on that which belongs to Judah and on the Negev of Caleb, and we burned Ziklag with fire.”

Now it happened after the death of Saul, that David returned from striking down the Amalekites. Then David remained two days in Ziklag.

“And he said to me, ‘Who are you?’ And I answered him, ‘I am an Amalekite.’

Now all his servants passed on beside him, all the Cherethites, all the Pelethites, and all the Gittites, six hundred men who had come with him from Gath, passed on before the king.

They helped David against the marauding band, for they were all mighty men of valor, and were commanders in the army.

So they took all the men and went to fight with Ishmael the son of Nethaniah, and they found him by the great pool that is in Gibeon.

David Strikes Down the Amalekites