Then Asa went out against him, and they set the battle in array in the valley of Zephathah at Mareshah.

Jamieson-Fausset-Brown Bible Commentary

10. Then Asa went out against him, and they set the battle in array . at Mareshah-one of the towns which Rehoboam fortified (2Ch 11:8), near a great southern pass in the low country of Judah (Jos 15:44). The engagement between the armies took place in a plain near the town, called "the valley of Zephathah," supposed to be the broad way coming down Beit Jibrin towards Tell Es-Safren [Robinson].

Matthew Henry's Concise Commentary

14:1-15 Asa's piety, He strengthens his kingdom. - Asa aimed at pleasing God, and studied to approve himself to him. Happy those that walk by this rule, not to do that which is right in their own eyes, or in the eye of the world, but which is so in God's sight. We find by experience that it is good to seek the Lord; it gives us rest; while we pursue the world, we meet with nothing but vexation. Asa consulted with his people how to make a good use of the peace they enjoyed; and concluded with them that they must not be idle, nor secure. A formidable army of Ethiopians invaded Asa's kingdom. This evil came upon them, that their faith in God might be tried. Asa's prayer is short, but it is the real language of faith and expectation from God. When we go forth in God's name, we cannot but prosper, and all things work together for the good of those whom he favours.