It is narrated from Sayyiduna Ubaid bin Umair (may Allah be pleased with him) that he was asked: "Who is the most virtuous martyr?" He replied: "The one whose blood is shed and whose horse is wounded."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3734
Hadith Takhrij«أخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 2557، وعبد الرزاق فى «مصنفه» برقم: 4844»