After the death of Saul, David returned from the slaughter of the Amalekites and stayed in Ziklag two days.

Genesis 14:7
Then they turned back to invade En-mishpat (that is, Kadesh), and they conquered the whole territory of the Amalekites, as well as the Amorites who lived in Hazazon-tamar.

1 Samuel 30:1
On the third day David and his men arrived in Ziklag, and the Amalekites had raided the Negev, attacked Ziklag, and burned it down.

1 Samuel 30:17
And David struck them down from twilight until the evening of the next day. Not a man escaped, except four hundred young men who fled, riding off on camels.

1 Samuel 31:6
So Saul, his three sons, his armor-bearer, and all his men died together that same day.

Now it came to pass after the death of Saul, when David was returned from the slaughter of the Amalekites, and David had stayed two days in Ziklag;