Chofetz Chaim Daily 11 Av 9:1 Asur to speak AVAK LH which is a negative inference eg. “who would think ploni would end up so good?”, “its better we dont talk about ploni” Praising ploni in presence of an enemy or excessive praise to any listener is also avak LH. 9:2 All praise is asur in public, except about universally
Chofetz Chaim Daily 10 Av 8:13 Asur for anyone to BELIEVE LH regardless of who the subject is, except for apikores & informers etc. 8:14 Likewise, it doesn’t matter who its heard from, even parents and family members. One is responsible for the behaviors of his household. He should therefore restrain them from LH and set a positive example.