Goliath
Goliath is described in the biblical Book of Samuel as a Philistine giant defeated by the young David in single combat. The story signified Saul's unfitness to rule, as Saul himself should have fought for the Kingdom of Israel.
Keilah
According to the biblical narrative in the first Book of Samuel, the Philistines had made an inroad eastward as far as Keilah, and had begun to appropriate the country for themselves, until David prevented them (). Later, he discerned in prayer that the inhabitants would prove unfaithful to him, in that they had offered to deliver him up to King Saul (). He and his 600 men "departed from Keilah, and went whithersoever they could go”. They fled to the woods in the wilderness of Ziph. "And David was in the wilderness of Ziph, in a wood" (). Here his friend Jonathan sought him out, "and strengthened his hand in God": this was the last meeting between David and Jonathan ().