הלכה על כתובות 91:25

The commandment that the wife of one who 'puts out a bad name' [about her] dwell with him forever: That we are commanded [about] one who puts out a bad name about his wife that she shall dwell with him forever - and even if she is blind or has a skin disease - as it is stated (Deuteronomy 22:19), "and to him shall she be a wife." And included in this law is that the court is commanded also to lash him about that which he put out a bad name falsely and to [fine] him one hundred coins (sela) of refined silver, as it is stated in the section [of the Torah that deals with this]. And they, may their memory be blessed, explained (Ketuvot 46a) that the warning against putting out a bad name is included in "do not go tale-bearing among your people" (Sefer HaChinukh 236).