1 Samuel 17:4 — KJ3 Literal Translation

⁴ And a man between the two came out from the armies of the Philistines, Goliath was his name, from Gath; his height was six cubits and a span.

Source: BiblicalTools.org — KJ3 (Literal Translation by Jay P. Green Sr.)

The armies of the Israelites and Philistines ready, Goliath issues a challenge. David takes the challenge. With no armor he kills the giant.