Musar zu Bamidbar 26:16

לאזני משפחת האזני . Rashi comments that Ozni is identical with אצבון (Genesis 46,16). Many commentators are puzzled by these various names mentioned, wanting to find some symbolism in them. I have heard that our rabbis have said that the fingers of man have been formed in the shape of pegs to enable him to put them inside his ears so as not to hear evil gossip. The word אצבעון is an allusion to this combination of finger and ear.