Goliath
Goliath (/ɡəˈlaɪəθ/ gə-LY-əth) is a Philistine warrior in the Book of Samuel. Descriptions of Goliath's immense stature vary among biblical sources, with the Masoretic Text describing him as 9 feet 9 inches (2.97 m) tall. Goliath issued a challenge to the Israelites, daring them to send forth a champion to engage him in single combat; he was ultimately defeated by the young shepherd David, employing a sling and stone as a weapon. The narrative signified King Saul's unfitness to rule, as Saul himself should have fought for Israel.
Modern scholars believe that the original slayer of Goliath may have been Elhanan, son of Jair, who features in 2 Samuel 21:19, in which Elhanan kills Goliath the Gittite, and that the authors of the Deuteronomic history changed the original text to credit the victory to the more famous character David.
The phrase "David and Goliath" has taken on a more popular meaning denoting an underdog situation, a contest wherein a smaller, weaker opponent faces a much bigger, stronger adversary.