The tribe of Benjamin, originally the smallest of all the tribes Numbers 1:36, if Ephraim and Manasseh are reckoned as one tribe, had been nearly annihilated by the civil war recorded in Judges 20. It had of course not recovered from that terrible calamity in the time of Saul, and was doubtless literally much the smallest tribe at that time. Nothing could be more improbable, humanly speaking, than that this weak tribe should give a ruler to the mighty tribes of Joseph and Judah.
Related Commentaries of 1 Samuel 9:21
1 Samuel 9:21
21 And Saul answered and said, Am not I a Benjamite, of the smallest of the tribes of Israel? and my family the least of all the families of the tribe of Benjamin? wherefore then speakest thou soj to me?