2 Sam 21: 15 Once again the Philistines were at war with Israel. And when David and his men were in the thick of battle, David became weak and exhausted.
16 Ishbi-benob was a descendant of the giants ; his bronze spearhead weighed more than seven pounds, and he was armed with a new sword. He had cornered David and was about to kill him.
17 But Abishai son of Zeruiah came to his rescue and killed the Philistine. After that, David's men declared, "You are not going out to battle again! Why should we risk snuffing out the light of Israel?"
18 After this, there was another battle against the Philistines at Gob. As they fought, Sibbecai from Hushah killed Saph, another descendant of the giants.
19 In still another battle at Gob, Elhanan son of Jair from Bethlehem killed the brother of Goliath of Gath. The handle of his spear was as thick as a weaver's beam!
20 In another battle with the Philistines at Gath, a huge man with six fingers on each hand and six toes on each foot -- a descendant of the giants --
21 defied and taunted Israel. But he was killed by Jonathan, the son of David's brother Shimea.
22 These four Philistines were descended from the giants of Gath, but they were killed by David and his warriors. (NLT)
We remember the story of how David defeated the giant "Goliath" with a rock from his sling. David spoke words of faith to the giant.
1 Sam 17:26 And David spake to the men that stood by him, saying, What shall be done to the man that killeth this Philistine, and taketh away the reproach from Israel? for who is this uncircumcised Philistine, that he should defy the armies of the living God?
Who can come against the Living God? David by faith was able to defeat Goliath. Later in this story David fought against four brothers of Goliath with other mighty men of God. David was about to be killed by one of the Giants as he was exhausted from battle, "But Abishai son of Zeruiah came to his rescue and killed the Philistine." A man of God may become exhausted from battle and this shows how that if we surround ourselves with others of faith that they will step in to help defeat the giant for us.
Who are the mighty men around us? Are they not the disciples of Jesus Christ? Men and women armed with the sword of faith, the word of God. When giants of discouragement, illness, tragedy, and want enter the life, these who are faithful speak words of faith and they pray connecting with the commander of the LORD's army. Through prayer every power from satan must flee for God is greater than all we must face in the battles of this life.