Cross reference
Joshua 12:15
15 The king of Libnah, one; the king of Adullam, one;
Joshua 10:29-30
29 Then Joshua passed from Makkedah, and all Israel with him, unto Libnah, and fought against Libnah:
30 And the LORD delivered it also, and the king thereof, into the hand of Israel; and he smote it with the edge of the sword, and all the souls that were therein; he let none remain in it; but did unto the king thereof as he did unto the king of Jericho.
1 Samuel 22:1
1 David therefore departed thence, and escaped to the cave Adullam: and when his brethren and all his father's house heard it, they went down thither to him.