23 The Israelites went up and wept before the LORD until evening, and they inquired of the LORD. They said, “Shall we go up again to fight against the Benjamites, our fellow Israelites?” The LORD answered, “Go up against them.”

Read Judges 20:23 Using Other Translations

(And the children of Israel went up and wept before the LORD until even, and asked counsel of the LORD, saying, Shall I go up again to battle against the children of Benjamin my brother? And the LORD said, Go up against him.)
And the people of Israel went up and wept before the LORD until the evening. And they inquired of the LORD, "Shall we again draw near to fight against our brothers, the people of Benjamin?" And the LORD said, "Go up against them."
For they had gone up to Bethel and wept in the presence of the LORD until evening. They had asked the LORD, “Should we fight against our relatives from Benjamin again?” And the LORD had said, “Go out and fight against them.”