It is narrated from Sayyiduna Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) named him "Muta'" and said to him: "O Muta', you are muta' (one who is obeyed) among your people." And he (peace and blessings be upon him) mounted him on a piebald horse, gave him the banner and said to him: "O Muta', go to your companions; whoever comes under this banner of mine is safe from the punishment."
This hadith is not narrated from Mas'ud bin al-Dahhak (may Allah be pleased with him) except with this chain, and our Shaykh Abd al-Rahman (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4781
Hadith Gradingمحدثین:في إسناده من لم يعرفهم الهيثمي
Hadith Takhrij«قال الهيثمي: في إسناده من لم أعرفهم «مجمع الزوائد ومنبع الفوائد، ج 9، ص 407»» «أخرجه الطبراني فى «الكبير» برقم: 785، والطبراني فى «الصغير» برقم: 680»