'Tribe' in the Bible

Saul replied, “Am I not a Benjamite, of the smallest of the tribes of Israel, and my family the least of all the families of the tribe of Benjamin? Why then do you speak to me in this way?”

Thus Samuel brought all the tribes of Israel near, and the tribe of Benjamin was taken by lot.

Then he brought the tribe of Benjamin near by its families, and the Matrite family was taken. And Saul the son of Kish was taken; but when they looked for him, he could not be found.