Sulaym bin Amir (may Allah have mercy on him) narrates: "I saw Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) dyeing (his hair) with henna and katam, while Sayyiduna Umar (may Allah be pleased with him) did not dye it, and he said: I heard the Messenger of Allah (peace and blessings be upon him) saying: 'Whoever grows a single grey hair in the path of Allah, it will be a light for him on the Day of Resurrection.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Thabit (may Allah have mercy on him) except Muhammad (may Allah have mercy on him)."
Hadith Referenceالمعجم الأوسط / باب الألف / 1825
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 2983، والضياء المقدسي فى «الأحاديث المختارة» برقم: 130، 129، وابن حجر فى «المطالب العالية» برقم: 2263 / 1، 2263 / 2، والطحاوي فى «شرح مشكل الآثار» برقم: 3692، والطبراني فى «الكبير» برقم: 57، 58»