Isaiah 9:4

For Thou hast broken the yoke of his burden, the spiritual slavery with which the people were burdened, and the staff of his shoulder, the reference being to the cudgel of the overseer in striking the back of the slave, the rod of his oppressor, with which the people were kept in subjection, as in the day of Midian, Judges 7:15. Even as the Lord, at the time of Gideon, had delivered Israel from the oppression of the Midianites in a miraculous manner, so He effected a deliverance from everlasting bondage, from spiritual slavery, so the Messiah overcame all the enemies of mankind and now divides the spoil among the believers everywhere.