Sahih Bukhari · Hadith 5198

حدثنا يحيى بن بكير، حدثنا الليث، عن جعفر بن ربيعة، عن الأعرج، قال قال أبو هريرة يأثر عن النبي صلى الله عليه وسلم قال ‏"‏ إياكم والظن، فإن الظن أكذب الحديث، ولا تجسسوا، ولا تحسسوا، ولا تباغضوا، وكونوا إخوانا ‏"‏‏.‏

Narrated Abu Huraira: The Prophet said, "Beware of suspicion (about others), as suspicion is the falsest talk, and do not spy upon each other, and do not listen to the evil talk of the people about others' affairs, and do not have enmity with one another, but be brothers. And none should ask for the hand of a girl who is already engaged to his (Muslim) brother, but one should wait till the first suitor marries her or leaves her."

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).