Then there came some that told Jehoshaphat, saying, There cometh a great multitude against thee from beyond the {b} sea on this side Syria; and, behold, they be in Hazazontamar, which is Engedi.

(b) Called the Dead sea, where God destroyed the five cities because of their sin.

Wesley's Notes

20:2 The sea - The dead sea, beyond which mount Seir lay. Syria - Largely so called, and so it includes the Moabites and Ammonites. And it may be thus expressed, to intimate that they came by the instigation of the Syrians, to revenge themselves of Jehoshaphat for joining with Ahab against them.

Jamieson-Fausset-Brown Bible Commentary

2. from beyond the sea on this side Syria-Instead of "Syria," some versions read "Edom," and many able critics prefer this reading, both because the nomad tribes here mentioned were far from Syria, and because express mention is made of Mount Seir, that is, Edom. The meaning then is: this confederate horde was composed of the different tribes that inhabited the far distant regions bordering on the northern and eastern coasts of the Red Sea. Their progress was apparently by the southern point of the Dead Sea, as far as En-gedi, which, more anciently, was called Hazezon-tamar (Ge 14:7). This is the uniform route taken by the Arabs in their marauding expeditions at the present day; and in coming round the southern end of the Dead Sea, they can penetrate along the low-lying Ghor far north, without letting their movements be known to the tribes and villages west of the mountain chain [Robinson]. Thus, anciently, the invading horde in Jehoshaphat's time had marched as far north as En-gedi, before intelligence of their advance was conveyed to the court. En-gedi is recognized in the modern Ainjidy and is situated at a point of the western shore, nearly equidistant from both extremities of the lake [Robinson].

Matthew Henry's Concise Commentary

20:1-13 In all dangers, public or personal, our first business should be to seek help from God. Hence the advantage of days for national fasting and prayer. From the first to the last of our seeking the Lord, we must approach him with humiliation for our sins, trusting only in his mercy and power. Jehoshaphat acknowledges the sovereign dominion of the Divine Providence. Lord, exert it on our behalf. Whom should we seek to, whom should we trust to for relief, but the God we have chosen and served. Those that use what they have for God, may comfortably hope he will secure it to them. Every true believer is a son of Abraham, a friend of God; with such the everlasting covenant is established, to such every promise belongs. We are assured of God's love, by his dwelling in human nature in the person of the Saviour. Jehoshaphat mentions the temple, as a token of God's favourable presence. He pleads the injustice of his enemies. We may well appeal to God against those that render us evil for good. Though he had a great army, he said, We have no might without thee; we rely upon thee.