Judges 20:28

and Phinehas, the son of Eleazar, the son of Aaron, stood before it in those days, so these events happened not long after the death of Joshua,) saying, Shall I yet again go out to battle against the children of Benjamin, my brother, or shall I cease? And the Lord, whose object of teaching the Israelites repentance and humility had been attained, said, Go up; for tomorrow I will deliver them into thine hand. This was not a mere permission, but a definite command, with a promise attached to it. Chastisements, such as the Lord laid upon Israel in this instance, are always beneficial to His children, for they make them realize their absolute dependence upon God and remind them of their many lapses in faithfulness and obedience toward Jehovah.