Joshua 14:6, 9, 14

One day, while Israel was encamped at Gilgal, the people of Judah approached Joshua, including Caleb son of Jephunneh from the Kenizzite clan. Caleb said to Joshua, “Remember what YAHWEH said to Moses about you and me while we were still at Kadesh Barnea.

On that day, Moses made an oath and promised me, ‘Every part of the land your feet tread upon shall be an inheritance for you and your descendants forever because you were loyal to YAHWEH, my God.’

So Hebron has belonged to Caleb son of Jephunneh the Kenizzite ever since because he passionately followed YAHWEH, the God of Israel.