Charles H. Spurgeon on Psalms 15:3

"Backbiteth." The word here used comes from a root signifying foot, and denotes a person who goes about from house to house, speaking things he should not (1 Timothy 5:13); and a word from this root siginifies spies; and the phrase here may point at persons who creep into houses, pry into the secrets of families, divulge them, and oftentimes represent them in a false light. Such are ranked among the worst of men, and are very unfit to be in the society of saints, or in the Church of Christ. See Romans 1:30. John Gill.