Psalms 15:3

[He that] backbiteth not with his tongue,.... Is not a slanderer, a defamer, a tale bearer; a backbiter is one who privately, secretly, behind a man's back speaks evil of him, devours and destroys his credit and reputation: the word here used comes from רגל, which signifies the "foot", and denotes such a person who goes about from house to house, speaking things he should not, 1 Timothy 5:13; and a word from this root signifies spies; and the phrase here may point at such persons who creep into houses, pry into the secrets of families, and divulge them, and oftentimes represent them in a false light. Such are ranked amongst the worst of men, and are very unfit to be in the society of the saints, or in a church of Christ; see Romans 1:30

2 Corinthians 12:20;

nor doeth evil to his neighbour: to any man whatever, good or bad, friend or foe, whether in a natural, civil, or spiritual relation, either by words or deeds, to his person, property, or good name;

nor taketh up, a reproach against his neighbour; does not raise any scandalous report on him himself, nor will he bear to hear one from another, much less will he spread one; nor will he suffer one to lie upon his neighbour, but will do all he can to vindicate him, and clear his character.