I heard the Messenger of Allah ﷺ say, "Do you know who the Muslim is?"They replied, "Allah and His Messenger know best."He said, "He is the one from whose tongue and hand the Muslims are safe."He then asked, "Do you know who the believer is?"They replied, "Allah and His Messenger know best."He said, "He is the one whom the believers trust with their lives and their wealth. And the emigrant is the one who forsakes evil and abandons it."
حدثنا زيد بن الحباب أخبرني موسى بن علي سمعت أبي يقول سمعت
سمعت رسول الله ﷺ يقول تدرون من المسلم قالوا الله ورسوله أعلم قال من سلم المسلمون من لسانه ويده قال تدرون من المؤمن قالوا الله ورسوله أعلم قال من أمنه المؤمنون على أنفسهم وأموالهم والمهاجر من هجر السوء فاجتنبه
Its chain of transmission is sahih. Musa bin Ali, his biography preceded at 4375. His father is Ali, in the diminutive form, bin Rabah, whose biography also preceded there. The full hadith is at 6912, and its meaning has already appeared several times, both at length and in brief, including at 6487.His saying "so avoid it" appears in one manuscript, in the margin of M, as "and avoid it."