It is reported from Sayyiduna Anas (may Allah be pleased with him). Al-Bazzar says: I did not find in my written record that it is from the Prophet (peace and blessings be upon him), but I think it is a marfu' hadith (the Prophet (peace and blessings be upon him) said): "Whoever goes out in the path of Allah, when he comes on the Day of Resurrection his blood will be more abundant than before; its colour will be like saffron, its fragrance will be like the fragrance of musk, and upon him will be the seal of the martyrs."
Al-Bazzar recorded it. Its chain contains a narrator, Ali bin Yazid al-Hanafi, whom I do not know. The rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9538