It is narrated from Malik bin Aws through Umar (may Allah be pleased with him) in the same manner, and (further) he said: "If I remain alive, even the shepherd of Sir Himyar will receive his due."
Hadith Referenceمسند الإمام الشافعي / كتاب الجهاد وقسم الغنائم / 1758
Hadith Takhrijاسناده ضعيف لضعف شیخ الشافعي : اخرجه البيهقى فى المعرفة السنن والآثار، رقم : (4010)۔