(Devarim 1:13) "Havu for yourselves": "Havu" connotes "counsel," as in (II Samuel 16:20) "Havu counsel for yourselves," (Shemoth 1:10) "Havah, let us plot (i.e., take counsel) against it."
"men": Would it enter our minds (that) women (are to be sought for this purpose)? What, then, is the intent of "men"? Venerable and revered.
"wise and understanding": As Arios asked R. Yossi: Who is wise? He answered: One who fulfills what he has learned. Arios: You say "one who fulfills what he has learned," but perhaps it means one who is understanding. Rebbi: "understanding" is already written. What is the difference between "understanding" and "wise"? The wise man is like a traveling money changer. When he is brought (coins to assess), he examines them. When he is not brought (coins), he sits idle. The understanding man is like a rich money-changer. When he is not brought (coins) to examine, he examines his own.
"and known among your tribes": They should be familiar to you. If someone comes cloaked in his talith and sits before me, I know nothing about him. But you know about him, for you grew up with him. Thus, "known to your tribes." R. Shimon b. Gamliel says: No (judicial) session begins until people bring it into question: Why did this man consent to sit (as a judge)? And why did this man not consent to sit?
"And I shall set them at your heads": For you might think that if you appoint them, they are appointed, and if you do not appoint them, they are not appointed; it is, therefore, written "And I shall set them." If I appoint them, they are appointed; if not, they are not appointed. I might think that if you have accorded them greatness they are great, and if not, they are not great; it is, therefore, written "at your heads."
Variantly: "and I shall set them at your heads": If you guard your ways, your heads (i.e., your judges) will be guarded, and if not, your heads will not be guarded — whence we are taught that the guilt of Israel is on the heads of their judges. And thus is it written (Ezekiel 33:7-9) "A sentinel have I made you for the house of Israel. When you hear a word from My mouth, you must warn them for Me." (If you do not warn the wicked one and he dies, his blood will be on your head.)