Chofetz Chaim Daily 21 Taamuz 6:1 Asur to BELIEVE LH, as it says Lo sisa sheima shav. Believing is worse than speaking. 6:2 Asur to LISTEN to LH. Mutar if there is a valid toeles, for example you’ll be able to protect yourself/others.
Chofetz Chaim Daily 22 Taamuz 6:3 If someone wants to tell you LH, ask him if there will be toeles for you to listen. Otherwise asur. 6:4 Mitzva to listen to LH IF: 1) Letting speaker finish his story will allow you to show listeners its false. 2) Listening to angry speaker will vent his anger and prevent from spreading further.