One of the greatest weapons to combat the enemy of worry is worship.

2 Chronicles 20. 

20:1 After this, the Moabites and Ammonites with some of the Neunites came to make war on Jehoshaphat. 

vs. 2 Some men came and told Jehoshaphat, ‘A vast army is coming against you from Edom, from the other side of the Sea. It is already in Hazazon Tamar’ (that is, En Gedi).

vs. 5- O LORD, God of our fathers, are you not the God who is in heaven? You rule over all the kingdoms of the nations. Power and might are in your hand, and no one can withstand you. 

vs. 10-11 But now here are men from Ammon, Moab and Mount Seir, whose territory you would not allow Israel to invade when they came from Egypt; so they turned away from them and did not destroy them. See how they are repaying us by coming to drive us out of the possession you gave us as an inheritance. 

vs. 12 For we have no power to face this vast army that is attacking us. We do not know what to do, but our eyes are upon you.

vs. 14 Then the Spirit of the LORD came upon Jahaziel son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, a Levite and the descendant of Asaph, as he stood in the assembly. 

vs. 15 He said: ‘Listen, King Jehoshaphat and all who live in Judah and Jerusalem! This is what the LORD says to you: ‘Do not be afraid or discouraged because of this vast army. For the battle is not yours, but God’s.

The enemy will always try to magnify the problem, but worship magnifies God’s power.

vs. 18-19 Jehoshaphat bowed with his face to the ground, and all the people of Judah and Jerusalem fell down in worship before the LORD. Then some Levites from the Kohathites and Korahites stood up and praised the LORD, the God of Israel, with a very loud voice.

vs. 20-21 Early in the morning they left for the Desert of Tekoa. 

As they set out, Jehoshaphat stood and said, ‘Listen to me, Judah (Judah means praise) and people of Jerusalem! Have faith in the LORD your God and you will be upheld…After consulting the people, Jehoshaphat appointed men to sing to the LORD and to praise him for the splendor of his holiness as they went out at the head of the army, saying: ‘Give thanks to the LORD, for his love endures forever.’

vs. 22 As they began to sing and praise…

vs. 22 As they began to sing and praise, the LORD set ambushes against the men of Ammon and Moab and Mount Seir who were invading Judah, and they were defeated.

vs. 23 The men of Ammon and Moab rose up against the men from Mount Seir to destroy and annihilate them. After they finished slaughtering the men from Seir, they helped to destroy one another.