And the children of Israel arose, and went up {k} to the house of God, and asked counsel of God, and said, Which of us shall go up first to the battle against the children of Benjamin? And the LORD said, Judah shall go up first.

(k) That is, to the ark, which was in Shiloh some think in Mizpeh, as in Jud 20:1.

Wesley's Notes

20:18 Children of Israel - Some sent in the name of all. House of God - To Shiloh, which was not far from Mizpeh. Which - This was asked to prevent emulations and contentions: but they do not ask whether they should go against them, or no, for that they knew they ought to do by the will of God already revealed: nor yet do they seek to God for his help by prayer, and fasting, and sacrifice, as in all reason they ought to have done; but were confident of success, because of their great numbers, and righteous cause.

Jamieson-Fausset-Brown Bible Commentary

Jud 20:18-28. The Israelites Lose Forty Thousand.

18-28. the children of Israel arose, and went up to the house of God-This consultation at Shiloh was right. But they ought to have done it at the commencement of their proceedings. Instead of this, all their plans were formed, and never doubting, it would seem, that the war was just and inevitable, the only subject of their inquiry related to the precedency of the tribes-a point which it is likely was discussed in the assembly. Had they asked counsel of God sooner, their expedition would have been conducted on a different principle-most probably by reducing the number of fighting men, as in the case of Gideon's army. As it was, the vast number of volunteers formed an excessive and unwieldy force, unfit for strenuous and united action against a small, compact, and well-directed army. A panic ensued, and the confederate tribes, in two successive engagements, sustained great losses. These repeated disasters (notwithstanding their attack on Benjamin had been divinely authorized) overwhelmed them with shame and sorrow. Led to reflection, they became sensible of their guilt in not repressing their national idolatries, as well as in too proudly relying on their superior numbers and the precipitate rashness of this expedition. Having humbled themselves by prayer and fasting, as well as observed the appointed method of expiating their sins, they were assured of acceptance as well as of victory. The presence and services of Phinehas on this occasion help us to ascertain the chronology thus far, that the date of the occurrence must be fixed shortly after the death of Joshua.

Matthew Henry's Concise Commentary

17:7-13 Micah thought it was a sign of God's favour to him and his images, that a Levite should come to his door. Thus those who please themselves with their own delusions, if Providence unexpectedly bring any thing to their hands that further them in their evil way, are apt from thence to think that God is pleased with them.