Adam Clarke on Leviticus 19:16

Thou shalt not go up and down as a tale-bearer - רכיל rachil signifies a trader, a peddler, and is here applied to the person who travels about dealing in scandal and calumny, getting the secrets of every person and family, and retailing them wherever he goes. A more despicable character exists not: such a person is a pest to society, and should be exiled from the habitations of men.

Neither shalt thou stand against the blood, etc. - Thou shalt not be as a false witness, because by such testimony the blood - the life of an innocent man may be endangered.