Psalms 15:3

He that backbiteth not with his tongue - לשנו על רגל לא lo ragal al leshono , "he foots not upon his tongue."

4. He is one who treats his neighbor with respect. He says nothing that might injure him in his character, person, or property; he forgets no calumny, he is author of no slander, he insinuates nothing by which his neighbor may be injured. The tongue, because of its slanderous conversation, is represented in the nervous original as kicking about the character of an absent person; a very common vice, and as destructive as it is common: but the man who expects to see God abhors it, and backbites not with his tongue. The words backbite and backbiter come from the Anglo-Saxon bac , the back, and to bite. How it came to be used in the sense it has in our language, seems at first view unaccountable; but it was intended to convey the treble sense of knavishness, cowardice, and brutality. He is a knave, who would rob you of your good name; he is a coward, that would speak of you in your absence what he dared not to do in your presence; and only an ill-conditioned dog would fly at and bite your back when your face was turned. All these three ideas are included in the term; and they all meet in the detractor and calumniator. His tongue is the tongue of a knave, a coward, and a dog. Such a person, of course, has no right to the privileges of the Church militant, and none of his disposition can ever see God.

Nor doeth evil to his neighbor -