David in battle against Goliath, will only use the sling with stone, tested and proved, by which the Lord has given him victory several times in the wilderness, but not the sword of King Saul to fight Goliath. Those who will not use the sword of the Lord with other available weapons mighty in him to pull down strongholds (2 Corinthians 10:4-9), but will seek for other battlements to fight and engage the enemy, shall die and perish by the sword of the enemy. 1 Samuel 17:39.