Narrated Suwayd ibn Hanzalah: We went out intending (to visit) the Messenger of Allah ﷺ and Wail ibn Hujr was with us. His enemy caught him. The people desisted from swearing an oath, but I took an oath that he was my brother. So he left him. We then came to the Messenger of Allah ﷺ, and I informed him that the people desisted from taking the oath, but I swore that he was my brother. He said: You spoke the truth: A Muslim is a brother of a Muslim.
Hadith Referenceسنن ابي داود / كتاب الأيمان والنذور / 3256
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:حسن, أخرجه ابن ماجه (2119 وسنده حسن) جدة إبراھيم بن عبد الأعلٰي وثقھا الحاكم والذهبي
Hadith Takhrij« سنن ابن ماجہ/الکفارات 14 (2119)، (تحفة الأشراف: 4809)، وقد أخرجہ: مسند احمد (4/79) (صحیح) »