The Messenger of Allah ﷺ said, "Every Muslim is forbidden to another Muslim in his wealth, his honor, and his blood. It is enough evil for a person to look down on his Muslim brother."
حدثنا واصل بن عبد الأعلى حدثنا أسباط بن محمد عن هشام بن سعد عن زيد بن أسلم عن أبي صالح
قال رسول الله ﷺ كل المسلم على المسلم حرام ماله وعرضه ودمه حسب امرئ من الشر أن يحقر أخاه المسلم
[Its isnad is hasan] Tirmidhi transmitted it in "The Book of Kindness and Ties of Kinship," chapter on what has been said concerning a Muslim's compassion for his fellow Muslim, no. 1927, from the hadith of Asbat bin Muhammad, by this route, and he said, "Hasan gharib." It has a corroborating witness in Muslim, no. 2564, so the hadith is sahih.