Hilchos Lashon Hara chapter 9, section 6
If someone told someone something, he may not repeat it to others unlike the person gave him permission and that is only if it is not lashon hara.
בס"ד
The Chofetz Chaim
Rav Yisroel Meir Hakohen of Radin zt"l known as the Chofetz Chaim, was one of the most famous rabbis before the Holocaust.Read more »