2 Kings 3

2 It would be difficult to top Ahab and Jezebel in doing evil. Jehoram did not indulge in idolatry, but he was an evil man nonetheless.
7 Jehoram did not feel that the army of Israel was strong enough to force Moab to comply with vassal taxation. Jehoshaphat had helped Jehoram's father Ahab in a previous battle, but that battle was a defeat for them. Judah did not have anything to gain from this battle, but he agrees to assist Jehoram to continue the alliance with Israel that has afforded them a degree of security.
9 The army had brought cattle for food, but had expected to find water along the way. However, the kings had decided to travel through the wilderness where there was no water.
10 Jehoram ignores his bad decision-making and blames God for their predicament.
11 Jehoshaphat worships God, and although he did not consult with God concerning participation in this battle, he now decides it is a good time to do so. We should not make the same mistake, and should earnestly pray before making "big decisions" in our lives. But even if we pray we will still find ourselves in difficult circumstances from time to time. We should also turn to God during these times and remember that we are dependent on Him.
13 Elisha shows open disdain for Jehoram. Jehoram's parents had vigorously persecuted God's prophets, and while Jehoram was not as idolatrous as his parents were, he was not a follower of God. Elisha points out the irony of this pagan king would come to a prophet of God for advice. Jehoram declares his right to be there because God is trying to destroy him and his companion kings.
14 Elisha emphasizes that God would not give a message to Jehoram, but would give a message for the sake of Jehoshaphat, who was sincerely seeking God's will. Another point of irony is that Jehoshaphat was considered the lesser king of the two because of military might, but he was exalted over Jehoram because of his devotion to God.
15 Elisha uses music to make a calm atmosphere of worship.
17 This may seem an unusual request. Sometimes God will ask us to do something a little odd, but He will always follow up on His promises. Note that work and waiting are required. Digging trenches is not easy, and they had to wait overnight to receive the water.
18 The fulfillment of the promise of water would be mysterious to the kings, but God considers this a trifle. God also promises that He will help the kings defeat the Moabites.
19 God charged the kings to execute His judgement against the Moabites. Their sin was so great that they had even defiled their land. God demanded that the people and the land be destroyed.
20 As God had promised, the trenches because filled with water. This apparently occurred underground, with the trenches closest to Edom filling first.
23 God had a dual purpose for the water. On the one hand, it strengthened the armies of the kings. On the other hand, it lured the Moabites into a battle unaware that the armies were waiting for them.
24 Just as God has promised, Israel and Judah won several victories over Moab.
25 In return, the armies executed God's judgement on the people and the land of Moab.
26 The king of Moab attempted to break the enemy lines, but was unsuccessful.
27 In an act of desperation the king of Moab offered his heir as a human sacrifice to his pagan god. We can see from this the cruel demands of such gods and the extent of the depravity of the people. Nonetheless, this rallied the troops. The armies, facing a rejuvenated enemy and horrified at the human sacrifice, retreated back to their respective countries.