Midrasch zu Schoftim 2:18

The ministering angels asked: Who is the one who caused the Shekhinah to depart from Israel? He replied: I have removed My Shekhinah from such-and-such place in which I have beheld a judge perverting justice, and I have forsaken that place, as is said: For the oppression of the poor, for the sighing of the needy, now will I arise, saith the Lord; I will set him in safety at whom they puff (Ps. 12:6). What does the Holy One, blessed be He, do? He unsheathes His sword before the judge to remind him that there is a judge on high, as is said: Be ye afraid of the sword; for wrath bringeth the punishments of the sword, that ye may know there is a judgment (Job 19:29). Shadin (“judgment, involvement”) is written here to indicate (by its similarity to Shaddai [Almighty]) that when a judge judges truthfully, the Shekhinah does not depart form that place, as it is said: When the Lord raised them up judges, then the Lord was moved to judge, and save them out of the hands of their enemies, all the days of the judge (Judg. 2:18). Thus it is written: Keep ye justice, and do righteousness; for My salvation is here to come (Isa. 56:1), that is, then I will associate Myself with you.