Al-Miswar bin Makhramah (may Allah be pleased with him) said: When Umar (may Allah be pleased with him) was stabbed, he ordered Suhayb (may Allah be pleased with him), the freed slave of Banu Jud'an, to lead the people in prayer.
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7256